Compare 20981 vs 21157
| Property | 20981 | 21157 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 209811 | 211571 |
| Prime factorization | 20981 | 21157 |
| Divisors count | 2 | 2 |
| Divisors | 1, 20981 | 1, 21157 |
| Number of properties | 5 | 5 |
| Chen primes | 1161st | |
| Good primes | 265th | |
| Isolated primes | 1659th | |
| Primes | 2359th | 2378th |
| Pythagorean primes | 1172nd | 1181st |
| Sexy primes (1st member) | 720th | |
| Sexy prime triplets (1st member) | 197th | |
| Twin primes (1st member) | 357th | |
| Roman numberals | ||
| Base 2 | 1010001111101012 | 1010010101001012 |
| Base 3 | 10012100023 | 10020001213 |
| Base 4 | 110133114 | 110222114 |
| Base 5 | 11324115 | 11341125 |
| Base 6 | 2410456 | 2415416 |
| Base 7 | 1151127 | 1154537 |
| Base 8 | 507658 | 512458 |
| Base 9 | 317029 | 320179 |
| Base 10 | 2098110 | 2115710 |
| Base 11 | 1484411 | 1499411 |
| Base 12 | 1018512 | 102b112 |
| Base 13 | 971c13 | 982613 |
| Base 14 | 790914 | 79d314 |
| Base 15 | 633b15 | 640715 |
| Base 16 | 51f516 | 52a516 |