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 | |||
| Quaternary | 31314 | |||
| Quinary | 13415 | |||
| Senary | 10056 | |||
| Octal | 3358 | |||
| Duodecimal | 16512 | |||
| Hexadecimal | DD16 | |||
| Vigesimal | B120 | |||
| Base 36 | 6536 | |||
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.
In other fields
221 is:
- SMTP status code for service closing transmission channel
- 221B Baker Street, the fictional London residence of Sherlock Holmes[2]
- The experiment number for Sparky in the Disney franchise Lilo & Stitch.
- .221 Remington Fireball, firearm cartridge
Historical years
gollark: Prove it by induction.
gollark: Something seems to repeatedly be sending me this.
gollark: I'm really worried about why I'm getting these emails.
gollark: This sort of thing is, of course, why more effective law enforcement is actually bad.
gollark: The average of at least 783 of them, uploaded into a LyricLy™.
References
- "Sloane's A001844 : Centered square numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
- Conan Doyle, Sir Arthur A Study in Scarlet pub. Wordsworth Editions Limited (2004) p.10 "We met next day, as [Holmes] had arranged, and inspected the rooms at No. 221B Baker Street, of which he had spoken at our meeting." ISBN 978-1-84022-411-5
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