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21 (nonm)

Depi Wikipedya, ansiklopedi lib
nan sistèm desimal
< 21 >
kadinal
òdinal
advèb
binè 101012
oktal 258
dyodesimal 1912
ekzadesimal 1516
women XXI
faktè yo 3 × 7
divizè yo 1, 3, 7, 21
φ(21) = 12 π(21) = 8
τ(21) = 4 μ(21) = 1
σ(21) = 32 M(21) = -2
s(21) = 11 a0(21) = 10
pwopriyete yo natirèl, antye ; konpose, defisyan
fòm yo
nan lòt sistèm yo
binè N/A
oktal 1710
dyodesimal 2510
ekzadesimal 3310

21 se yon nonm. Pou ekri li, yo itilize chif arab yo.

Matematik

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Nan sistèm desimal

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Se nonm antye natirèl ant 20 ak 22 nan sistèm desimal.

Nan lòt sistèm yo

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Divètisman

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Relijyon

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Syans imen

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Syans natirèl

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Teknoloji

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