21930902 has 32 divisors (see below), whose sum is σ = 40953600. Its totient is φ = 8594208.

The previous prime is 21930893. The next prime is 21930913. The reversal of 21930902 is 20903912.

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 in 15 ways as a sum of consecutive naturals, for example, 6293 + ... + 9135.

It is an arithmetic number, because the mean of its divisors is an integer number (1279800).

Almost surely, 2^21930902 is an apocalyptic number.

21930902 is a deficient number, since it is larger than the sum of its proper divisors (19022698).

21930902 is a wasteful number, since it uses less digits than its factorization.

21930902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 21930902 is about 4683.0440954576. The cubic root of 21930902 is about 279.9102688661.

The spelling of 21930902 in words is "twenty-one million, nine hundred thirty thousand, nine hundred two".