21404632 has 32 divisors (see below), whose sum is σ = 43873920. Its totient is φ = 9745920.

The previous prime is 21404623. The next prime is 21404653. The reversal of 21404632 is 23640412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1678 + ... + 6754.

It is an arithmetic number, because the mean of its divisors is an integer number (1371060).

Almost surely, 2^21404632 is an apocalyptic number.

It is an amenable number.

21404632 is an abundant number, since it is smaller than the sum of its proper divisors (22469288).

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

21404632 is a wasteful number, since it uses less digits than its factorization.

21404632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5131 (or 5127 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21404632 is about 4626.5140224579. The cubic root of 21404632 is about 277.6531395086.

The spelling of 21404632 in words is "twenty-one million, four hundred four thousand, six hundred thirty-two".