21932 has 6 divisors (see below), whose sum is σ = 38388. Its totient is φ = 10964.

The previous prime is 21929. The next prime is 21937. The reversal of 21932 is 23912.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21932.

It is not an unprimeable number, because it can be changed into a prime (21937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2738 + ... + 2745.

It is an arithmetic number, because the mean of its divisors is an integer number (6398).

2²¹⁹³² is an apocalyptic number.

It is an amenable number.

21932 is a deficient number, since it is larger than the sum of its proper divisors (16456).

21932 is a wasteful number, since it uses less digits than its factorization.

21932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5487 (or 5485 counting only the distinct ones).

The product of its digits is 108, while the sum is 17.

The square root of 21932 is about 148.0945643837. The cubic root of 21932 is about 27.9914940149.

The spelling of 21932 in words is "twenty-one thousand, nine hundred thirty-two".