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121 (number) - Wikipedia
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Natural number
121 (one hundred [and] twenty-one) is the natural number following 120 and preceding 122.
One hundred [and] twenty-one is
A Chinese checkers board has 121 holes.
- In decimal, 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 ( 11 2 {\displaystyle 11^{2}} ). But it cannot be expressed as the sum of any other number plus that number's digits, making 121 a self number.
Integers −1 0s
100s
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- 100,000
- 1,000,000
- 10,000,000
- 100,000,000
- 1,000,000,000
- 10,000,000,000
- 100,000,000,000
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