21 (alƙalami)

21
positive integer (en) , deficient number (en) , triangular number (en) , odd number (en) , centered pentachoric number (en) , octagonal number (en) , highly touchable number (en) , Fibonacci number (en) , composite number (en) da harshad number (en)
Bayanai
Name in hiero markup (en)	V20-V20-Z1
Mabiyi	ashirin
Ta biyo baya	22
Prime factor (en)	uku da bakwai

21

21 (ashirin da ɗaya) alƙalami ne, tsakanin 20 da 22.