21231932 has 24 divisors (see below), whose sum is σ = 39102000. Its totient is φ = 10074240.

The previous prime is 21231923. The next prime is 21231937. The reversal of 21231932 is 23913212.

It is a junction number, because it is equal to n+sod(n) for n = 21231898 and 21231907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4319 + ... + 7817.

It is an arithmetic number, because the mean of its divisors is an integer number (1629250).

It is a self-describing number.

Almost surely, 2^21231932 is an apocalyptic number.

It is an amenable number.

21231932 is a deficient number, since it is larger than the sum of its proper divisors (17870068).

21231932 is a wasteful number, since it uses less digits than its factorization.

21231932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581 (or 3579 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 21231932 is about 4607.8120621397. The cubic root of 21231932 is about 276.9043881896.

The spelling of 21231932 in words is "twenty-one million, two hundred thirty-one thousand, nine hundred thirty-two".