33 (number) - Wikipedia
https://en.wikipedia.org:443/wiki/33_(number)
WEBIn mathematics. 33 is the 21st composite number, and 8th distinct semiprime (third of the form where is a higher prime). [1] It is one of two numbers to have an aliquot sum of 15 = 3 × 5 — the other being the square of 4 — and part of the aliquot sequence of 9 = 3 2 in the aliquot tree (33, 15, 9, 4, 3, 2, 1 ).
DA: 85 PA: 33 MOZ Rank: 86