Names of 18421
| Nominal | 18421 |
| Cardinal | eighteen thousand four hundred twenty-one |
| Ordinal | 18,421st |
| This number as US currency | eighteen thousand four hundred twenty-one dollars |
| Is 18421 an odd number? | 18421 is an odd number |
| Is 18421 an even number? | 18421 is NOT an even number |
| Is 18421 a palindrome? | 18421 is NOT a palindrome number |
| Is 18421 a triangle number? | 18421 is NOT a triangle number |
18421 in other Bases
| Base 2 (Binary) | 1000111111101012 |
| Base 3 (Ternary) | 2210210213 |
| Base 4 (Quaternary) | 101333114 |
| Base 5 (Quinary) | 10421415 |
| Base 6 (Senary) | 2211416 |
| Base 8 (Octal) | 437658 |
| Base 12 (Duodecimal) | A7B112 |
| Base 16 (Hexadecimal) | 47F516 |
| Base 20 (Vigesimal) | 261120 |
Primes and Factors tests for 18421
| Is 18421 a Prime Number? | 18421 is NOT a prime |
| Is 18421 a perfect number? | 18421 is NOT a perfect number |
| Is 18421 a Mersenne Prime? | 18421 is NOT a Mersenne prime |
| Is 18421 a Fermat Prime? | 18421 is NOT a Fermat prime |
| Is 18421 a Fibonacci Prime? | 18421 is NOT a Fibonacci prime |
| Is 18421 a Partition Prime? | 18421 is NOT a Partition prime |
| Is 18421 a Pell Prime? | 18421 is NOT a Pell prime |
| Prime Factors | Prime factors of 18421 |
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18421 in other Numerals
| 18421 in Roman Numeral | XVMMMCDXXI |
| 18421 in Chinese Numeral | 壹萬捌仟肆佰貳拾壹 |
| 18421 in Egyptian Numeral | 𓂭𓇃𓍥𓎇𓏺 |
| 18421 in Babylonian Numeral |    |
Roots and stuff for 18421
| Is 18421 a square number? | 18421 is NOT a square number |
| Is 18421 a cube number? | 18421 is NOT a cube number |
| Square root of the number 18421 | 135.72398461584 |
| Cube root of the number 18421 | 26.410162142273 |
Recreational math for 18421
| Number 18421 reversed | 12481 |
| Sum of the digits | 16 |
| No of digits | 5 |