| Clue | Source | Date |
|---|---|---|
| 1 followed by 21 zeros | ||
| Racy message to unwell cruciverbalist on 22-digit number (10) | ||
| Huge number, male or female, given work at home, love to get stuck in | The Telegraph Toughie | 25 Sep 2019 |
| One thousand raised to the seventh power | The Telegraph General Knowledge | 24 Jan 2016 |
| One followed by 21 zeros | ||
| 1,000,000,000,000,000,000,000 |