21680752 has 10 divisors (see below), whose sum is σ = 42006488. Its totient is φ = 10840368.

The previous prime is 21680741. The next prime is 21680783. The reversal of 21680752 is 25708612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677508 + ... + 677539.

Almost surely, 2^21680752 is an apocalyptic number.

It is an amenable number.

21680752 is a deficient number, since it is larger than the sum of its proper divisors (20325736).

21680752 is a wasteful number, since it uses less digits than its factorization.

21680752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355055 (or 1355049 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 21680752 is about 4656.2594429434. The cubic root of 21680752 is about 278.8419517406.

The spelling of 21680752 in words is "twenty-one million, six hundred eighty thousand, seven hundred fifty-two".