21321832 has 32 divisors (see below), whose sum is σ = 46667520. Its totient is φ = 8942400.

The previous prime is 21321829. The next prime is 21321841. The reversal of 21321832 is 23812312.

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, 1419 + ... + 6682.

It is an arithmetic number, because the mean of its divisors is an integer number (1458360).

Almost surely, 2^21321832 is an apocalyptic number.

It is an amenable number.

21321832 is an abundant number, since it is smaller than the sum of its proper divisors (25345688).

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

21321832 is a wasteful number, since it uses less digits than its factorization.

21321832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8161 (or 8157 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 21321832 is about 4617.5569298061. The cubic root of 21321832 is about 277.2946596611.

The spelling of 21321832 in words is "twenty-one million, three hundred twenty-one thousand, eight hundred thirty-two".