Compare 21381 vs 21391
| Property | 21381 | 21391 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 31 × 71271 | 213911 |
| Prime factorization | 3 × 7127 | 21391 |
| Divisors count | 4 | 2 |
| Divisors | 1, 3, 7127, 21381 | 1, 21391 |
| Number of properties | 1 | 3 |
| Isolated primes | 1676th | |
| Primes | 2401st | |
| Semiprimes | 5417th | |
| Sexy primes (1st member) | 729th | |
| Roman numberals | ||
| Base 2 | 1010011100001012 | 1010011100011112 |
| Base 3 | 10020222203 | 10021000213 |
| Base 4 | 110320114 | 110320334 |
| Base 5 | 11410115 | 11410315 |
| Base 6 | 2425536 | 2430116 |
| Base 7 | 1162237 | 1162367 |
| Base 8 | 516058 | 516178 |
| Base 9 | 322869 | 323079 |
| Base 10 | 2138110 | 2139110 |
| Base 11 | 1507811 | 1508711 |
| Base 12 | 1045912 | 1046712 |
| Base 13 | 996913 | 997613 |
| Base 14 | 7b1314 | 7b1d14 |
| Base 15 | 650615 | 651115 |
| Base 16 | 538516 | 538f16 |