21 (število)
naravno število From Wikipedia, the free encyclopedia
naravno število From Wikipedia, the free encyclopedia
21 (ênaindvájset) je naravno število, za katero velja 21 = 20 + 1 = 22 − 1.
| |||
Glavni števnik | enaindvajset | ||
Vrstilni števnik | enaindvajseti | ||
Razcep | |||
Rimska številka | XXI | ||
Dvojiško | 10101 | ||
Šestnajstiško | 15 | ||
Matematične lastnosti | |||
---|---|---|---|
φ(21) = 12 | |||
τ(21) = 4 {1, 3, 7, 21} | |||
σ(21) = 32 | |||
π(21) = 8 | |||
μ(21) = 1 | |||
M(21) = -2 |
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