21163232 has 24 divisors (see below), whose sum is σ = 44117136. Its totient is φ = 9958912.

The previous prime is 21163229. The next prime is 21163253. The reversal of 21163232 is 23236112.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18908 + ... + 19995.

It is an arithmetic number, because the mean of its divisors is an integer number (1838214).

Almost surely, 2^21163232 is an apocalyptic number.

It is an amenable number.

21163232 is an abundant number, since it is smaller than the sum of its proper divisors (22953904).

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

21163232 is a wasteful number, since it uses less digits than its factorization.

21163232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38930 (or 38922 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 21163232 is about 4600.3512909342. The cubic root of 21163232 is about 276.6054063492.

Adding to 21163232 its reverse (23236112), we get a palindrome (44399344).

The spelling of 21163232 in words is "twenty-one million, one hundred sixty-three thousand, two hundred thirty-two".