21929612 has 6 divisors (see below), whose sum is σ = 38376828. Its totient is φ = 10964804.

The previous prime is 21929599. The next prime is 21929623. The reversal of 21929612 is 21692912.

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, 2741198 + ... + 2741205.

It is an arithmetic number, because the mean of its divisors is an integer number (6396138).

Almost surely, 2^21929612 is an apocalyptic number.

It is an amenable number.

21929612 is a deficient number, since it is larger than the sum of its proper divisors (16447216).

21929612 is a wasteful number, since it uses less digits than its factorization.

21929612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5482407 (or 5482405 counting only the distinct ones).

The product of its digits is 3888, while the sum is 32.

The square root of 21929612 is about 4682.9063625061. The cubic root of 21929612 is about 279.9047805476.

The spelling of 21929612 in words is "twenty-one million, nine hundred twenty-nine thousand, six hundred twelve".