21000932 has 48 divisors (see below), whose sum is σ = 40279680. Its totient is φ = 9554688.

The previous prime is 21000913. The next prime is 21000953. The reversal of 21000932 is 23900012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000932.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287648 + ... + 287720.

It is an arithmetic number, because the mean of its divisors is an integer number (839160).

Almost surely, 2^21000932 is an apocalyptic number.

It is an amenable number.

21000932 is a deficient number, since it is larger than the sum of its proper divisors (19278748).

21000932 is a wasteful number, since it uses less digits than its factorization.

21000932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 210 counting only the distinct ones).

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

The square root of 21000932 is about 4582.6773833644. The cubic root of 21000932 is about 275.8964990338.

Adding to 21000932 its reverse (23900012), we get a palindrome (44900944).

The spelling of 21000932 in words is "twenty-one million, nine hundred thirty-two", and thus it is an aban number.