21

21

positive integer, deficient number, triangular number, odd number, centered pentachoric number, octagonal number, highly touchable number, Fibonacci number, composite number, harshad number

Name in hiero markup	V20-V20-Z1
Follows	20
Followed by	22
Prime factor	3, 7
Unicode character	㉑

Àuyàa ka waɗi (21) ayam làmba ne ma mbèesu. Dita ne lamba ma hàuyàa ka waɗi a lìssafi.