211 (two hundred
ndeleven) is the
natural number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country").
Numbers used for counting are called ''cardinal ...
following
210
Year 210 ( CCX) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Faustinus and Rufinus (or, less frequently, year 963 '' Ab urbe condit ...
and preceding
212
Year 212 ( CCXII) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Asper and Camilius (or, less frequently, year 965 '' Ab urbe condit ...
. It is also a
prime number
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...
.
In mathematics
211 is an
odd
Odd means unpaired, occasional, strange or unusual, or a person who is viewed as eccentric.
Odd may also refer to:
Acronym
* ODD (Text Encoding Initiative) ("One Document Does it all"), an abstracted literate-programming format for describing X ...
number.
211 is a
primorial prime In mathematics, a primorial prime is a prime number of the form ''pn''# ± 1, where ''pn''# is the primorial of ''pn'' (i.e. the product of the first ''n'' primes).
Primality tests show that
: ''pn''# − 1 is prime for ''n ...
, sum of three consecutive
prime
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...
s (67 + 71 + 73),
Chen prime
A prime number ''p'' is called a Chen prime if ''p'' + 2 is either a prime or a product of two primes (also called a semiprime). The even number 2''p'' + 2 therefore satisfies Chen's theorem.
The Chen primes are named after Chen Jingru ...
,
centered decagonal prime, and
self prime.
211 is the smallest prime separated by 10 or more from the nearest primes (199 and 223). It is thus a balanced prime and an ''isolated prime''.
211 is a
repdigit
In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal). The word is a portmanteau of repeated and digit.
Example ...
in
base 14 (111).
Multiplying its digits, it is still a prime (2), and adding its digits, it is square (4). Rearranging its digits, 211 becomes 121, which also is a square. Adding any two of its digits will be prime (2 or 3).
211 is a super-prime.
In science and technology
2-1-1
2-1-1 is a special abbreviated telephone number reserved in the North American Numbering Plan (NANP) as an easy-to-remember three-digit code to reach information and referral services to health, human, and social service organizations.
Like the ...
is special abbreviated telephone number reserved in Canada and the United States as an easy-to-remember three-digit telephone number. It is meant to provide quick information and referrals to health and human service organizations for both services from charities and from governmental agencies.
In chemistry, 211 is also associated with E211, the preservative
sodium benzoate
Sodium benzoate is the sodium salt of benzoic acid, widely used as a food preservative (with an E number of E211) and a pickling agent. It appears as a white crystalline chemical with the formula C6H5COONa.
Production
Sodium benzoate is commo ...
.
In religions
In Islam, Sermon 211 is about the strength and greatness of Allah.
In other fields
211 is also the
California Penal Code section defining
robbery.
It is sometimes paired with
187
Year 187 ( CLXXXVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Quintius and Aelianus (or, less frequently, year 940 '' Ab urbe ...
, California PC section for
murder.
211 is also an EDI (
Electronic data interchange) document known as an Electronic Bill of Lading.
211 is also a nickname for
Steel Reserve, a
malt liquor alcoholic beverage.
211 is also
SMTP
The Simple Mail Transfer Protocol (SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients ty ...
status code for system status.
+211 is the code for international direct-dial phone calls to
South Sudan
South Sudan (; din, Paguot Thudän), officially the Republic of South Sudan ( din, Paankɔc Cuëny Thudän), is a landlocked country in East Africa. It is bordered by Ethiopia, Sudan, Central African Republic, Democratic Republic of the ...
.
See also
*
211 Crew
211 Crew is a white supremacist prison gang, active both in and out of prison, that was formed in 1995 at Colorado's Denver County Jail. It was linked to several high-profile murders and criminal investigations. Those included the assassination o ...
References
Integers
{{num-stub
ca:Nombre 210#Nombres del 211 al 219