21150908 has 6 divisors (see below), whose sum is σ = 37014096. Its totient is φ = 10575452.

The previous prime is 21150887. The next prime is 21150911. The reversal of 21150908 is 80905112.

It is a happy number.

It is a congruent number.

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, 2643860 + ... + 2643867.

It is an arithmetic number, because the mean of its divisors is an integer number (6169016).

Almost surely, 2^21150908 is an apocalyptic number.

It is an amenable number.

21150908 is a deficient number, since it is larger than the sum of its proper divisors (15863188).

21150908 is a wasteful number, since it uses less digits than its factorization.

21150908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287731 (or 5287729 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 21150908 is about 4599.0116329490. The cubic root of 21150908 is about 276.5517039824.

The spelling of 21150908 in words is "twenty-one million, one hundred fifty thousand, nine hundred eight".