221 (number)

Two hundred blackjacks redirects here. This article is relating to number 221. For the year, to see 221.

221 (two hundred blackjacks) is the Entier naturalness which follows 220 and which precedes 222.

In mathematics

Two hundreds twenty-and-un' is:
  • the sum of five consecutive prime numbers (37 + 41 + 43 + 47 + 53)
  • the sum of nine consecutive prime numbers (11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41)
  • a square Nombre centered
  • the Fonction of Mertens turns over 5, a high record which holds until number 554.

In other fields

Two hundred blackjacks is also:
  • the code of statute smtp for fermerture of the service of the transmission channel.
  • in the mysteries of Sherlock Holmes of Arthur Conan Doyle, the number of the house 221B on the street Baker, where Sherlock Holmes and Doctor Watson for several years with Mrs Hudson for owner lived.
  • historical Years: -221, 221

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