Compare 21581 vs 21587
| Property | 21581 | 21587 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 71 × 30831 | 215871 |
| Prime factorization | 7 × 3083 | 21587 |
| Divisors count | 4 | 2 |
| Divisors | 1, 7, 3083, 21581 | 1, 21587 |
| Number of properties | 1 | 6 |
| Additive primes | 1124th | |
| Chen primes | 1189th | |
| Harmonic primes | 891st | |
| Primes | 2423rd | |
| Semiprimes | 5459th | |
| Super primes | 360th | |
| Twin primes (1st member) | 367th | |
| Roman numberals | ||
| Base 2 | 1010100010011012 | 1010100010100112 |
| Base 3 | 10021210223 | 10021211123 |
| Base 4 | 111010314 | 111011034 |
| Base 5 | 11423115 | 11423225 |
| Base 6 | 2435256 | 2435356 |
| Base 7 | 1166307 | 1166367 |
| Base 8 | 521158 | 521238 |
| Base 9 | 325389 | 325459 |
| Base 10 | 2158110 | 2158710 |
| Base 11 | 1523a11 | 1524511 |
| Base 12 | 105a512 | 105ab12 |
| Base 13 | 9a9113 | 9a9713 |
| Base 14 | 7c1714 | 7c1d14 |
| Base 15 | 65db15 | 65e215 |
| Base 16 | 544d16 | 545316 |