Names of 21985
| Nominal | 21985 |
| Cardinal | twenty-one thousand nine hundred eighty-five |
| Ordinal | 21,985th |
| This number as US currency | twenty-one thousand nine hundred eighty-five dollars |
| Is 21985 an odd number? | 21985 is an odd number |
| Is 21985 an even number? | 21985 is NOT an even number |
| Is 21985 a palindrome? | 21985 is NOT a palindrome number |
| Is 21985 a triangle number? | 21985 is NOT a triangle number |
21985 in other Bases
| Base 2 (Binary) | 1010101111000012 |
| Base 3 (Ternary) | 10100110213 |
| Base 4 (Quaternary) | 111132014 |
| Base 5 (Quinary) | 12004205 |
| Base 6 (Senary) | 2454416 |
| Base 8 (Octal) | 527418 |
| Base 12 (Duodecimal) | 1088112 |
| Base 16 (Hexadecimal) | 55E116 |
| Base 20 (Vigesimal) | 2EJ520 |
Primes and Factors tests for 21985
| Is 21985 a Prime Number? | 21985 is NOT a prime |
| Is 21985 a perfect number? | 21985 is NOT a perfect number |
| Is 21985 a Mersenne Prime? | 21985 is NOT a Mersenne prime |
| Is 21985 a Fermat Prime? | 21985 is NOT a Fermat prime |
| Is 21985 a Fibonacci Prime? | 21985 is NOT a Fibonacci prime |
| Is 21985 a Partition Prime? | 21985 is NOT a Partition prime |
| Is 21985 a Pell Prime? | 21985 is NOT a Pell prime |
| Prime Factors | Prime factors of 21985 |
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21985 in other Numerals
| 21985 in Roman Numeral | XXMCMLXXXV |
| 21985 in Chinese Numeral | 貳萬壹仟玖佰捌拾伍 |
| 21985 in Egyptian Numeral | 𓂮𓆼𓍪𓎍𓏾 |
| 21985 in Babylonian Numeral |   |
Roots and stuff for 21985
| Is 21985 a square number? | 21985 is NOT a square number |
| Is 21985 a cube number? | 21985 is NOT a cube number |
| Square root of the number 21985 | 148.27339613026 |
| Cube root of the number 21985 | 28.014023587465 |
Recreational math for 21985
| Number 21985 reversed | 58912 |
| Sum of the digits | 25 |
| No of digits | 5 |