21afdo
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| Prime factorization | 3 × 7 |
| Fifth | 32/21 (729.219c) |
| Dual sharp fifth | 32/21 (729.219c) |
| Dual flat fifth | 31/21 (674.254c) |
21afdo (arithmetic frequency division of the octave), or 21odo (otonal division of the octave), divides the octave into 21 parts of 1/21 each. As a scale it may be known as mode 21 of the harmonic series or the Over-21 scale.