21412924 has 24 divisors (see below), whose sum is σ = 42481040. Its totient is φ = 9362304.

The previous prime is 21412889. The next prime is 21412949. The reversal of 21412924 is 42921412.

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 7 ways as a sum of consecutive naturals, for example, 9849 + ... + 11824.

Almost surely, 2^21412924 is an apocalyptic number.

It is an amenable number.

21412924 is a deficient number, since it is larger than the sum of its proper divisors (21068116).

21412924 is a wasteful number, since it uses less digits than its factorization.

21412924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21709 (or 21707 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 21412924 is about 4627.4100747610. The cubic root of 21412924 is about 277.6889884875.

The spelling of 21412924 in words is "twenty-one million, four hundred twelve thousand, nine hundred twenty-four".