Talen 2121 till 2127 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2121 | = | MMCXXI | = | 1000 + 1000 + 100 + 10 + 10 + 1 |
| 2122 | = | MMCXXII | = | 1000 + 1000 + 100 + 10 + 10 + 1 + 1 |
| 2123 | = | MMCXXIII | = | 1000 + 1000 + 100 + 10 + 10 + 1 + 1 + 1 |
| 2124 | = | MMCXXIV | = | 1000 + 1000 + 100 + 10 + 10 + 5 − 1 |
| 2125 | = | MMCXXV | = | 1000 + 1000 + 100 + 10 + 10 + 5 |
| 2126 | = | MMCXXVI | = | 1000 + 1000 + 100 + 10 + 10 + 5 + 1 |
| 2127 | = | MMCXXVII | = | 1000 + 1000 + 100 + 10 + 10 + 5 + 1 + 1 |