21732856 has 16 divisors (see below), whose sum is σ = 41124600. Its totient is φ = 10766304.

The previous prime is 21732839. The next prime is 21732859. The reversal of 21732856 is 65823712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21732859) 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, 11590 + ... + 13333.

Almost surely, 2^21732856 is an apocalyptic number.

It is an amenable number.

21732856 is a deficient number, since it is larger than the sum of its proper divisors (19391744).

21732856 is a wasteful number, since it uses less digits than its factorization.

21732856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25038 (or 25034 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 21732856 is about 4661.8511344744. The cubic root of 21732856 is about 279.0651475329.

The spelling of 21732856 in words is "twenty-one million, seven hundred thirty-two thousand, eight hundred fifty-six".