121
Everything about the number 121 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 121
| Nominal | 121 |
| Cardinal | one hundred twenty-one |
| Ordinal | 121st |
| This number as US currency | one hundred twenty-one dollars |
Properties (and some facts) of 121
| Is 121 an odd number? | 121 is an odd number |
| Is 121 an even number? | 121 is not an even number |
| Is 121 a palindrome? | 121 is a palindrome |
| Is 121 a triangle number? | 121 is not a triangle number |
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121 in other bases
| Base 2 (Binary) | 1111001 |
| Base 3 (Ternary) | 11111 |
| Base 4 (Quaternary) | 1321 |
| Base 5 (Quinary) | 441 |
| Base 6 (Senary) | 321 |
| Base 8 (Octal) | 171 |
| Base 12 (Duodecimal) | A1 |
| Base 16 (Hexadecimal) | 79 |
| Base 20 (Vigesimal) | 61 |
Primes and factors tests for 121
| Is 121 a prime number? | 121 is not a prime number |
| Is 121 a perfect number? | 121 is not a perfect number |
| Is 121 a Mersenne prime? | 121 is not a Mersenne prime |
| Is 121 a Fermat prime? | 121 is not a Fermat prime |
| Is 121 a Fibonacci prime? | 121 is not a Fibonacci prime |
| Is 121 a partition prime? | 121 is not a partition prime |
| Is 121 a Pell prime? | 121 is not a Pell prime |
| Prime Factors | Prime factors of 121 |
121 in other numeral systems
| 121 in Roman numerals | CXXI |
| 121 in Chinese numerals | 壹佰貳拾壹 |
| 121 in Babylonian numerals |   |
| 121 in Egyptian numerals | 𓍢𓎇𓏺 |
Roots and squares for 121
| Is 121 a square number? | 121 is a square number |
| Is 121 a cube number? | 121 is not a cube number |
| Square root of 121 | 11 |
| Cube root of 121 | 4.9460874432487 |
Recreational math for 121
| Number 121 reversed | 121 |
| Sum of the digits | 4 |
| Number of digits | 3 |
Arithmetic tables for 121
Other pages about 121
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