Science Fair Project Encyclopedia
121 (number)
121 is the natural number following 120 and preceding 122.
| Cardinal | One hundred [and] twenty-one |
| Ordinal | 121st |
| Factorization | 112 |
| Roman numeral | CXXI |
| Binary | 1111001 |
| Hexadecimal | 79 |
One hundred twenty-one is a square and is the sum of three consecutive primes (37 + 41 + 43). It is also a star number and a centered octagonal number. In base 10, it is a Smith number since its digits add up to the same value as its factorization (which uses the same digits) and as a consequence of that it is a Friedman number. But it can not be expressed as the sum of any other number plus that number's digits, making 121 a self 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.
Last updated: 05-24-2005 03:23:08
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details