21633136 has 20 divisors (see below), whose sum is σ = 47902192. Its totient is φ = 9271296.

The previous prime is 21633127. The next prime is 21633149. The reversal of 21633136 is 63133612.

It is a self number, because there is not a number n which added to its sum of digits gives 21633136.

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, 96465 + ... + 96688.

Almost surely, 2^21633136 is an apocalyptic number.

It is an amenable number.

21633136 is an abundant number, since it is smaller than the sum of its proper divisors (26269056).

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

21633136 is a wasteful number, since it uses less digits than its factorization.

21633136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193168 (or 193162 counting only the distinct ones).

The product of its digits is 1944, while the sum is 25.

The square root of 21633136 is about 4651.1435153089. The cubic root of 21633136 is about 278.6376680777.

Adding to 21633136 its reverse (63133612), we get a palindrome (84766748).

The spelling of 21633136 in words is "twenty-one million, six hundred thirty-three thousand, one hundred thirty-six".