Names of 21987
| Nominal | 21987 |
| Cardinal | twenty-one thousand nine hundred eighty-seven |
| Ordinal | 21,987th |
| This number as US currency | twenty-one thousand nine hundred eighty-seven dollars |
| Is 21987 an odd number? | 21987 is an odd number |
| Is 21987 an even number? | 21987 is NOT an even number |
| Is 21987 a palindrome? | 21987 is NOT a palindrome number |
| Is 21987 a triangle number? | 21987 is NOT a triangle number |
21987 in other Bases
| Base 2 (Binary) | 1010101111000112 |
| Base 3 (Ternary) | 10100111003 |
| Base 4 (Quaternary) | 111132034 |
| Base 5 (Quinary) | 12004225 |
| Base 6 (Senary) | 2454436 |
| Base 8 (Octal) | 527438 |
| Base 12 (Duodecimal) | 1088312 |
| Base 16 (Hexadecimal) | 55E316 |
| Base 20 (Vigesimal) | 2EJ720 |
Primes and Factors tests for 21987
| Is 21987 a Prime Number? | 21987 is NOT a prime |
| Is 21987 a perfect number? | 21987 is NOT a perfect number |
| Is 21987 a Mersenne Prime? | 21987 is NOT a Mersenne prime |
| Is 21987 a Fermat Prime? | 21987 is NOT a Fermat prime |
| Is 21987 a Fibonacci Prime? | 21987 is NOT a Fibonacci prime |
| Is 21987 a Partition Prime? | 21987 is NOT a Partition prime |
| Is 21987 a Pell Prime? | 21987 is NOT a Pell prime |
| Prime Factors | Prime factors of 21987 |
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21987 in other Numerals
| 21987 in Roman Numeral | XXMCMLXXXVII |
| 21987 in Chinese Numeral | 貳萬壹仟玖佰捌拾柒 |
| 21987 in Egyptian Numeral | 𓂮𓆼𓍪𓎍𓐀 |
| 21987 in Babylonian Numeral |   |
Roots and stuff for 21987
| Is 21987 a square number? | 21987 is NOT a square number |
| Is 21987 a cube number? | 21987 is NOT a cube number |
| Square root of the number 21987 | 148.28014027509 |
| Cube root of the number 21987 | 28.014873050709 |
Recreational math for 21987
| Number 21987 reversed | 78912 |
| Sum of the digits | 27 |
| No of digits | 5 |