Names of 21997
| Nominal | 21997 |
| Cardinal | twenty-one thousand nine hundred ninety-seven |
| Ordinal | 21,997th |
| This number as US currency | twenty-one thousand nine hundred ninety-seven dollars |
| Is 21997 an odd number? | 21997 is an odd number |
| Is 21997 an even number? | 21997 is NOT an even number |
| Is 21997 a palindrome? | 21997 is NOT a palindrome number |
| Is 21997 a triangle number? | 21997 is NOT a triangle number |
21997 in other Bases
| Base 2 (Binary) | 1010101111011012 |
| Base 3 (Ternary) | 10100112013 |
| Base 4 (Quaternary) | 111132314 |
| Base 5 (Quinary) | 12004425 |
| Base 6 (Senary) | 2455016 |
| Base 8 (Octal) | 527558 |
| Base 12 (Duodecimal) | 1089112 |
| Base 16 (Hexadecimal) | 55ED16 |
| Base 20 (Vigesimal) | 2EJH20 |
Primes and Factors tests for 21997
| Is 21997 a Prime Number? | 21997 is a prime |
| Is 21997 a perfect number? | 21997 is NOT a perfect number |
| Is 21997 a Mersenne Prime? | 21997 is NOT a Mersenne prime |
| Is 21997 a Fermat Prime? | 21997 is NOT a Fermat prime |
| Is 21997 a Fibonacci Prime? | 21997 is NOT a Fibonacci prime |
| Is 21997 a Partition Prime? | 21997 is NOT a Partition prime |
| Is 21997 a Pell Prime? | 21997 is NOT a Pell prime |
| Prime Factors | Prime factors of 21997 |
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21997 in other Numerals
| 21997 in Roman Numeral | XXMCMXCVII |
| 21997 in Chinese Numeral | 貳萬壹仟玖佰玖拾柒 |
| 21997 in Egyptian Numeral | 𓂮𓆼𓍪𓎎𓐀 |
| 21997 in Babylonian Numeral |   |
Roots and stuff for 21997
| Is 21997 a square number? | 21997 is NOT a square number |
| Is 21997 a cube number? | 21997 is NOT a cube number |
| Square root of the number 21997 | 148.31385639919 |
| Cube root of the number 21997 | 28.019119594415 |
Recreational math for 21997
| Number 21997 reversed | 79912 |
| Sum of the digits | 28 |
| No of digits | 5 |