21132634 has 16 divisors (see below), whose sum is σ = 32221800. Its totient is φ = 10393600.

The previous prime is 21132623. The next prime is 21132659. The reversal of 21132634 is 43623112.

It can be written as a sum of positive squares in 4 ways, for example, as 20277009 + 855625 = 4503^2 + 925^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46842 + ... + 47290.

Almost surely, 2^21132634 is an apocalyptic number.

21132634 is a deficient number, since it is larger than the sum of its proper divisors (11089166).

21132634 is a wasteful number, since it uses less digits than its factorization.

21132634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785.

The product of its digits is 864, while the sum is 22.

The square root of 21132634 is about 4597.0244724169. The cubic root of 21132634 is about 276.4720358191.

Adding to 21132634 its reverse (43623112), we get a palindrome (64755746).

The spelling of 21132634 in words is "twenty-one million, one hundred thirty-two thousand, six hundred thirty-four".