211 (number)

For other uses, see 211 (disambiguation).

← 210 211 212 →
← 210 211 212 213 214 215 216 217 218 219 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred eleven
Ordinal	211th (two hundred eleventh)
Factorization	prime
Prime	47th
Divisors	1, 211
Greek numeral	ΣΙΑ´
Roman numeral	CCXI, ccxi
Binary	110100112
Ternary	212113
Senary	5516
Octal	3238
Duodecimal	15712
Hexadecimal	D316

211 (two hundred [and] eleven) is the natural number following 210 and preceding 212. It is also a prime number.

In mathematics

• 211 is the sum of three consecutive primes (${\displaystyle 67+71+73}$), a Chen prime, ^[1] a centered decagonal prime, and a self prime. ^[2]
• 211 is the smallest prime separated by 12 from the nearest primes (199 and 223). It is thus a balanced prime ^[3] and an isolated prime . ^[4]
• 211 is a repdigit in tetradecimal (111).
• 211 is the 47th prime number and therefore it is a super-prime. ^[5]

In other fields

211 is also a nickname for Steel Reserve, a malt liquor alcoholic beverage.

211 is also SMTP status code for system status.

References

1. Sloane, N. J. A. (ed.). "SequenceA109611(chen prime)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
2. "Sloane's A006378 Prime self numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
3. Sloane, N. J. A. (ed.). "SequenceA006562(balanced prime)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
4. Sloane, N. J. A. (ed.). "SequenceA023186(Lonely (or isolated) primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
5. Sloane, N. J. A. (ed.). "SequenceA006450(Prime-indexed primes: primes with prime subscripts)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.