21563932 has 12 divisors (see below), whose sum is σ = 40639816. Its totient is φ = 9952560.

The previous prime is 21563923. The next prime is 21563947. The reversal of 21563932 is 23936512.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21563894 and 21563903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207294 + ... + 207397.

Almost surely, 2^21563932 is an apocalyptic number.

It is an amenable number.

21563932 is a deficient number, since it is larger than the sum of its proper divisors (19075884).

21563932 is a wasteful number, since it uses less digits than its factorization.

21563932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414708 (or 414706 counting only the distinct ones).

The product of its digits is 9720, while the sum is 31.

The square root of 21563932 is about 4643.6980952685. The cubic root of 21563932 is about 278.3402317803.

The spelling of 21563932 in words is "twenty-one million, five hundred sixty-three thousand, nine hundred thirty-two".