21633332 has 12 divisors (see below), whose sum is σ = 43266720. Its totient is φ = 9271416.

The previous prime is 21633329. The next prime is 21633349. The reversal of 21633332 is 23333612.

21633332 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21633298 and 21633307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386282 + ... + 386337.

It is an arithmetic number, because the mean of its divisors is an integer number (3605560).

Almost surely, 2^21633332 is an apocalyptic number.

It is an amenable number.

21633332 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21633332 is a wasteful number, since it uses less digits than its factorization.

21633332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772630 (or 772628 counting only the distinct ones).

The product of its digits is 1944, while the sum is 23.

The square root of 21633332 is about 4651.1645853485. The cubic root of 21633332 is about 278.6385095772.

Adding to 21633332 its reverse (23333612), we get a palindrome (44966944).

The spelling of 21633332 in words is "twenty-one million, six hundred thirty-three thousand, three hundred thirty-two".