21064432 has 10 divisors (see below), whose sum is σ = 40812368. Its totient is φ = 10532208.

The previous prime is 21064363. The next prime is 21064471. The reversal of 21064432 is 23446012.

It is a happy number.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658248 + ... + 658279.

Almost surely, 2^21064432 is an apocalyptic number.

It is an amenable number.

21064432 is a deficient number, since it is larger than the sum of its proper divisors (19747936).

21064432 is a wasteful number, since it uses less digits than its factorization.

21064432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316535 (or 1316529 counting only the distinct ones).

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

The square root of 21064432 is about 4589.6004183371. The cubic root of 21064432 is about 276.1742930480.

The spelling of 21064432 in words is "twenty-one million, sixty-four thousand, four hundred thirty-two".