Compare 21215 vs 21221
| Property | 21215 | 21221 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 42431 | 212211 |
| Prime factorization | 5 × 4243 | 21221 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 4243, 21215 | 1, 21221 |
| Number of properties | 1 | 6 |
| Chen primes | 1172nd | |
| Isolated primes | 1665th | |
| Primes | 2386th | |
| Pythagorean primes | 1184th | |
| Semiprimes | 5376th | |
| Sexy primes (1st member) | 723rd | |
| Sophie germain primes | 346th | |
| Roman numberals | ||
| Base 2 | 1010010110111112 | 1010010111001012 |
| Base 3 | 10020022023 | 10020022223 |
| Base 4 | 110231334 | 110232114 |
| Base 5 | 11343305 | 11343415 |
| Base 6 | 2421156 | 2421256 |
| Base 7 | 1155657 | 1156047 |
| Base 8 | 513378 | 513458 |
| Base 9 | 320829 | 320889 |
| Base 10 | 2121510 | 2122110 |
| Base 11 | 14a3711 | 14a4211 |
| Base 12 | 1033b12 | 1034512 |
| Base 13 | 986c13 | 987513 |
| Base 14 | 7a3514 | 7a3b14 |
| Base 15 | 644515 | 644b15 |
| Base 16 | 52df16 | 52e516 |