121 (number)
121 is the natural number following 120 and preceding 122.
| |||
| Cardinal | One hundred [and] twenty-one | ||
| Ordinal | 121st | ||
| Factorization | |||
| Roman numeral | CXXI | ||
| Binary | 1111001 | ||
| Hexadecimal | 79 | ||
One hundred twenty-one is the sum of three consecutive primes (37 + 41 + 43). It is also a Smith number and a star number.
One hundred twenty-one is also:
- The number for voicemail for mobile phones on the Vodafone network
- The model number of the Lockheed EC-121, now on display at the Air Force Museum.
- The year AD 121 or 121 BC.
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