21/20

Interval information

Ratio

21/20

Factorization

2^-2 × 3 × 5^-1 × 7

[-2 1 -1 1⟩

Size in cents

84.46719¢

Names

minor semitone,
large septimal chromatic semitone

zg2, zogu 2nd

[math]\displaystyle{ \text{m2}^{7}_{5} }[/math]

Special properties

8.71425

Weil height (log₂ max(n, d))

8.78463

19

A small semitone, 21/20 may be found in 7-limit just intonation as, for example, the difference between 8/7 and 6/5, or between 5/3 and 7/4.