Compare 21987 vs 21989
| Property | 21987 | 21989 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 32 × 71 × 3491 | 111 × 19991 |
| Prime factorization | 3 × 3 × 7 × 349 | 11 × 1999 |
| Divisors count | 12 | 4 |
| Divisors | 1, 3, 7, 9, 21, 63, 349, 1047, 2443, 3141, 7329, 21987 | 1, 11, 1999, 21989 |
| Number of properties | 0 | 1 |
| Semiprimes | 5552nd | |
| Roman numberals | ||
| Base 2 | 1010101111000112 | 1010101111001012 |
| Base 3 | 10100111003 | 10100111023 |
| Base 4 | 111132034 | 111132114 |
| Base 5 | 12004225 | 12004245 |
| Base 6 | 2454436 | 2454456 |
| Base 7 | 1210507 | 1210527 |
| Base 8 | 527438 | 527458 |
| Base 9 | 331409 | 331429 |
| Base 10 | 2198710 | 2198910 |
| Base 11 | 1557911 | 1558011 |
| Base 12 | 1088312 | 1088512 |
| Base 13 | a01413 | a01613 |
| Base 14 | 802714 | 802914 |
| Base 15 | 67ac15 | 67ae15 |
| Base 16 | 55e316 | 55e516 |