Английская Википедия:221 (number)
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Шаблон:Infobox number 221 (two hundred [and] twenty-one) is the natural number following 220 and preceding 222.
In mathematics
Its factorization as 13 × 17 makes 221 the product of two consecutive prime numbers, the sixth smallest such product.[1]
221 is a centered square number.[2]
In other fields
In Texas hold 'em, the probability of being dealt pocket aces (the strongest possible outcome in the initial deal of two cards per player) is 1/221.[3]
Sherlock Holmes's home address: 221B Baker Street.
References
