Names of 21989
| Nominal | 21989 |
| Cardinal | twenty-one thousand nine hundred eighty-nine |
| Ordinal | 21,989th |
| This number as US currency | twenty-one thousand nine hundred eighty-nine dollars |
| Is 21989 an odd number? | 21989 is an odd number |
| Is 21989 an even number? | 21989 is NOT an even number |
| Is 21989 a palindrome? | 21989 is NOT a palindrome number |
| Is 21989 a triangle number? | 21989 is NOT a triangle number |
21989 in other Bases
| Base 2 (Binary) | 1010101111001012 |
| Base 3 (Ternary) | 10100111023 |
| Base 4 (Quaternary) | 111132114 |
| Base 5 (Quinary) | 12004245 |
| Base 6 (Senary) | 2454456 |
| Base 8 (Octal) | 527458 |
| Base 12 (Duodecimal) | 1088512 |
| Base 16 (Hexadecimal) | 55E516 |
| Base 20 (Vigesimal) | 2EJ920 |
Primes and Factors tests for 21989
| Is 21989 a Prime Number? | 21989 is NOT a prime |
| Is 21989 a perfect number? | 21989 is NOT a perfect number |
| Is 21989 a Mersenne Prime? | 21989 is NOT a Mersenne prime |
| Is 21989 a Fermat Prime? | 21989 is NOT a Fermat prime |
| Is 21989 a Fibonacci Prime? | 21989 is NOT a Fibonacci prime |
| Is 21989 a Partition Prime? | 21989 is NOT a Partition prime |
| Is 21989 a Pell Prime? | 21989 is NOT a Pell prime |
| Prime Factors | Prime factors of 21989 |
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21989 in other Numerals
| 21989 in Roman Numeral | XXMCMLXXXIX |
| 21989 in Chinese Numeral | 貳萬壹仟玖佰捌拾玖 |
| 21989 in Egyptian Numeral | 𓂮𓆼𓍪𓎍𓐂 |
| 21989 in Babylonian Numeral |   |
Roots and stuff for 21989
| Is 21989 a square number? | 21989 is NOT a square number |
| Is 21989 a cube number? | 21989 is NOT a cube number |
| Square root of the number 21989 | 148.28688411319 |
| Cube root of the number 21989 | 28.015722462442 |
Recreational math for 21989
| Number 21989 reversed | 98912 |
| Sum of the digits | 29 |
| No of digits | 5 |