221 (number)
221 (two hundred [and] twenty-one) is the natural number following 220 and preceding 222.
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| Cardinal | two hundred twenty-one | |||
| Ordinal | 221st (two hundred twenty-first) | |||
| Factorization | 13 × 17 | |||
| Greek numeral | ΣΚΑ´ | |||
| Roman numeral | CCXXI | |||
| Binary | 110111012 | |||
| Ternary | 220123 | |||
| Octal | 3358 | |||
| Duodecimal | 16512 | |||
| Hexadecimal | DD16 | |||
In mathematics
221 is:
- a product of two prime numbers, 13 and 17, making it a semiprime
- 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 centered square number[1]
- Mertens function(221) = 5 a record high that stands until 554
- If you deal 2 cards from a single deck of 52 cards, you have a 1 in 221 chance of getting 2 aces.
References
- "Sloane's A001844 : Centered square numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
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