21752908 has 6 divisors (see below), whose sum is σ = 38067596. Its totient is φ = 10876452.

The previous prime is 21752893. The next prime is 21752921. The reversal of 21752908 is 80925712.

It is an unprimeable number.

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, 2719110 + ... + 2719117.

Almost surely, 2^21752908 is an apocalyptic number.

It is an amenable number.

21752908 is a deficient number, since it is larger than the sum of its proper divisors (16314688).

21752908 is a wasteful number, since it uses less digits than its factorization.

21752908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438231 (or 5438229 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 21752908 is about 4664.0012864492. The cubic root of 21752908 is about 279.1509484083.

The spelling of 21752908 in words is "twenty-one million, seven hundred fifty-two thousand, nine hundred eight".