Compare 21809 vs 21821
| Property | 21809 | 21821 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 1131 × 1931 | 218211 |
| Prime factorization | 113 × 193 | 21821 |
| Divisors count | 4 | 2 |
| Divisors | 1, 113, 193, 21809 | 1, 21821 |
| Number of properties | 1 | 6 |
| Chen primes | 1201st | |
| Cousin primes (2nd member) | 372nd | |
| Isolated primes | 1707th | |
| Long primes | 926th | |
| Primes | 2448th | |
| Pythagorean primes | 1215th | |
| Semiprimes | 5510th | |
| Roman numberals | ||
| Base 2 | 1010101001100012 | 1010101001111012 |
| Base 3 | 10022202023 | 10022210123 |
| Base 4 | 111103014 | 111103314 |
| Base 5 | 11442145 | 11442415 |
| Base 6 | 2445456 | 2450056 |
| Base 7 | 1204047 | 1204227 |
| Base 8 | 524618 | 524758 |
| Base 9 | 328229 | 328359 |
| Base 10 | 2180910 | 2182110 |
| Base 11 | 1542711 | 1543811 |
| Base 12 | 1075512 | 1076512 |
| Base 13 | 9c0813 | 9c1713 |
| Base 14 | 7d3b14 | 7d4914 |
| Base 15 | 66de15 | 66eb15 |
| Base 16 | 553116 | 553d16 |