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21 (son) - Vikipediya Kontent qismiga oʻtish

21 (son)

Vikipediya, erkin ensiklopediya
21
18 · 19 · 20 · 21 · 22 · 23 · 24
Sonlar roʻyxatiButun sonlar
Oʻqilishi yigirma bir
Tartibi 21chi
(yigirma birinchi)
Faktorizatsiya 3×7
Rimcha koʻrinishi XXI
Ikkilik yozuvida 10101
Sakkizlik yozuvida 25
Oʻn oltilik yozuvida 15

21 (yigirma bir) — 20 va 22 sonlari orasidagi natural son.

21 = 3 × 7

  • The Penguin Dictionary of Curious and Interesting Numbers (inglizcha) Walles, David: . London: Penguin Books, 1987. 










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