The folowing table expresses '1921' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR11 | DR10 | DR9 | DR8 | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 11110000001 | 101 | 10 | 1 | |||||||
| 3 | 2122011 | 100 | 1 | ||||||||
| 4 | 132001 | 13,10 | 1 | ||||||||
| 5 | 30141 | 14,10 | 1 | ||||||||
| 6 | 12521 | 15,10 | 1 | ||||||||
| 7 | 5413 | 16,10 | 1 | ||||||||
| 8 | 3601 | 12 | 3 | ||||||||
| 9 | 2564 | 18,10 | 1 | ||||||||
| 10 | 1921 | 13 | 4 | ||||||||
| 11 | 1497 | 1A,10 | 1 | ||||||||
| 12 | 1141 | 7 | |||||||||
| 13 | B4A | 1C,10 | 1 | ||||||||
| 14 | 9B3 | 19 | A | ||||||||
| 15 | 881 | 12 | 3 | ||||||||
| 16 | 781 | 10 | 1 |
Factors: 17 * 113