Names of 20421
| Nominal | 20421 |
| Cardinal | twenty thousand four hundred twenty-one |
| Ordinal | 20,421st |
| This number as US currency | twenty thousand four hundred twenty-one dollars |
| Is 20421 an odd number? | 20421 is an odd number |
| Is 20421 an even number? | 20421 is NOT an even number |
| Is 20421 a palindrome? | 20421 is NOT a palindrome number |
| Is 20421 a triangle number? | 20421 is NOT a triangle number |
20421 in other Bases
| Base 2 (Binary) | 1001111110001012 |
| Base 3 (Ternary) | 10010001003 |
| Base 4 (Quaternary) | 103330114 |
| Base 5 (Quinary) | 11231415 |
| Base 6 (Senary) | 2343136 |
| Base 8 (Octal) | 477058 |
| Base 12 (Duodecimal) | B99912 |
| Base 16 (Hexadecimal) | 4FC516 |
| Base 20 (Vigesimal) | 2B1120 |
Primes and Factors tests for 20421
| Is 20421 a Prime Number? | 20421 is NOT a prime |
| Is 20421 a perfect number? | 20421 is NOT a perfect number |
| Is 20421 a Mersenne Prime? | 20421 is NOT a Mersenne prime |
| Is 20421 a Fermat Prime? | 20421 is NOT a Fermat prime |
| Is 20421 a Fibonacci Prime? | 20421 is NOT a Fibonacci prime |
| Is 20421 a Partition Prime? | 20421 is NOT a Partition prime |
| Is 20421 a Pell Prime? | 20421 is NOT a Pell prime |
| Prime Factors | Prime factors of 20421 |
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20421 in other Numerals
| 20421 in Roman Numeral | XXCDXXI |
| 20421 in Chinese Numeral | 貳萬肆佰貳拾壹 |
| 20421 in Egyptian Numeral | 𓂮𓍥𓎇𓏺 |
| 20421 in Babylonian Numeral |    |
Roots and stuff for 20421
| Is 20421 a square number? | 20421 is NOT a square number |
| Is 20421 a cube number? | 20421 is NOT a cube number |
| Square root of the number 20421 | 142.90206436577 |
| Cube root of the number 20421 | 27.333316808768 |
Recreational math for 20421
| Number 20421 reversed | 12402 |
| Sum of the digits | 9 |
| No of digits | 5 |