21320032 has 24 divisors (see below), whose sum is σ = 42140952. Its totient is φ = 10617600.

The previous prime is 21320021. The next prime is 21320051. The reversal of 21320032 is 23002312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21319994 and 21320021.

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, 7807 + ... + 10177.

It is an arithmetic number, because the mean of its divisors is an integer number (1755873).

Almost surely, 2^21320032 is an apocalyptic number.

It is an amenable number.

21320032 is a deficient number, since it is larger than the sum of its proper divisors (20820920).

21320032 is a wasteful number, since it uses less digits than its factorization.

21320032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662 (or 2654 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21320032 is about 4617.3620174294. The cubic root of 21320032 is about 277.2868563224.

Adding to 21320032 its reverse (23002312), we get a palindrome (44322344).

The spelling of 21320032 in words is "twenty-one million, three hundred twenty thousand, thirty-two".