21311932 has 12 divisors (see below), whose sum is σ = 37346680. Its totient is φ = 10641456.

The previous prime is 21311903. The next prime is 21311933. The reversal of 21311932 is 23911312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103 + ... + 6529.

Almost surely, 2^21311932 is an apocalyptic number.

It is an amenable number.

21311932 is a deficient number, since it is larger than the sum of its proper divisors (16034748).

21311932 is a wasteful number, since it uses less digits than its factorization.

21311932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7260 (or 7258 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

The square root of 21311932 is about 4616.4848098959. The cubic root of 21311932 is about 277.2517358617.

The spelling of 21311932 in words is "twenty-one million, three hundred eleven thousand, nine hundred thirty-two".