21732908 has 6 divisors (see below), whose sum is σ = 38032596. Its totient is φ = 10866452.

The previous prime is 21732901. The next prime is 21732913. The reversal of 21732908 is 80923712.

It is not an unprimeable number, because it can be changed into a prime (21732901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2716610 + ... + 2716617.

It is an arithmetic number, because the mean of its divisors is an integer number (6338766).

Almost surely, 2^21732908 is an apocalyptic number.

It is an amenable number.

21732908 is a deficient number, since it is larger than the sum of its proper divisors (16299688).

21732908 is a wasteful number, since it uses less digits than its factorization.

21732908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433231 (or 5433229 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21732908 is about 4661.8567116547. The cubic root of 21732908 is about 279.0653701049.

The spelling of 21732908 in words is "twenty-one million, seven hundred thirty-two thousand, nine hundred eight".