421
Everything about the number 421 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 421
| Nominal | 421 |
| Cardinal | four hundred twenty-one |
| Ordinal | 421st |
| This number as US currency | four hundred twenty-one dollars |
Properties (and some facts) of 421
| Is 421 an odd number? | 421 is an odd number |
| Is 421 an even number? | 421 is not an even number |
| Is 421 a palindrome? | 421 is not a palindrome |
| Is 421 a triangle number? | 421 is not a triangle number |
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421 in other bases
| Base 2 (Binary) | 110100101 |
| Base 3 (Ternary) | 120121 |
| Base 4 (Quaternary) | 12211 |
| Base 5 (Quinary) | 3141 |
| Base 6 (Senary) | 1541 |
| Base 8 (Octal) | 645 |
| Base 12 (Duodecimal) | 2B1 |
| Base 16 (Hexadecimal) | 1A5 |
| Base 20 (Vigesimal) | 111 |
Primes and factors tests for 421
| Is 421 a prime number? | 421 is a prime number |
| Is 421 a perfect number? | 421 is not a perfect number |
| Is 421 a Mersenne prime? | 421 is not a Mersenne prime |
| Is 421 a Fermat prime? | 421 is not a Fermat prime |
| Is 421 a Fibonacci prime? | 421 is not a Fibonacci prime |
| Is 421 a partition prime? | 421 is not a partition prime |
| Is 421 a Pell prime? | 421 is not a Pell prime |
| Prime Factors | Prime factors of 421 |
421 in other numeral systems
| 421 in Roman numerals | CDXXI |
| 421 in Chinese numerals | 肆佰貳拾壹 |
| 421 in Babylonian numerals |   |
| 421 in Egyptian numerals | 𓍥𓎇𓏺 |
Roots and squares for 421
| Is 421 a square number? | 421 is not a square number |
| Is 421 a cube number? | 421 is not a cube number |
| Square root of 421 | 20.518284528683 |
| Cube root of 421 | 7.4948112258591 |
Recreational math for 421
| Number 421 reversed | 124 |
| Sum of the digits | 7 |
| Number of digits | 3 |
Arithmetic tables for 421
Other pages about 421
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