Compare 21881 vs 21891
| Property | 21881 | 21891 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 218811 | 31 × 72971 |
| Prime factorization | 21881 | 3 × 7297 |
| Divisors count | 2 | 4 |
| Divisors | 1, 21881 | 1, 3, 7297, 21891 |
| Number of properties | 4 | 1 |
| Chen primes | 1204th | |
| Isolated primes | 1712th | |
| Primes | 2455th | |
| Pythagorean primes | 1217th | |
| Semiprimes | 5527th | |
| Roman numberals | ||
| Base 2 | 1010101011110012 | 1010101100000112 |
| Base 3 | 10100001023 | 10100002103 |
| Base 4 | 111113214 | 111120034 |
| Base 5 | 12000115 | 12000315 |
| Base 6 | 2451456 | 2452036 |
| Base 7 | 1205367 | 1205527 |
| Base 8 | 525718 | 526038 |
| Base 9 | 330129 | 330239 |
| Base 10 | 2188110 | 2189110 |
| Base 11 | 1549211 | 154a111 |
| Base 12 | 107b512 | 1080312 |
| Base 13 | 9c6213 | 9c6c13 |
| Base 14 | 7d8d14 | 7d9914 |
| Base 15 | 673b15 | 674615 |
| Base 16 | 557916 | 558316 |