How rare is 21?
21
Rarity score25.0
MythicRarer than 100% of all numbers
- Fibonacci number1 in 33,333 · +15.0 bits
- Digit sum 31 in 17,857 · +14.1 bits
- Triangular number1 in 707 · +9.5 bits
- Harshad number1 in 10 · +3.4 bits
- Semiprime1 in 5 · +2.3 bits
- Zero-free1 in 2 · +0.7 bits
- Digit sum
- 3
- Digital root
- 3
- Parity
- Odd
What does that mean?
Scores are computed from exact trait counts across all 1,000,001 numbers from 0 to 1,000,000 — see the scoring formula and the pattern library for the traits behind this number.