21238974 has 24 divisors (see below), whose sum is σ = 46219680. Its totient is φ = 7048608.

The previous prime is 21238969. The next prime is 21238981. The reversal of 21238974 is 47983212.

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 in 11 ways as a sum of consecutive naturals, for example, 1834 + ... + 6770.

It is an arithmetic number, because the mean of its divisors is an integer number (1925820).

Almost surely, 2^21238974 is an apocalyptic number.

21238974 is an abundant number, since it is smaller than the sum of its proper divisors (24980706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21238974 is a wasteful number, since it uses less digits than its factorization.

21238974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5184 (or 5181 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 21238974 is about 4608.5761358580. The cubic root of 21238974 is about 276.9349984540.

The spelling of 21238974 in words is "twenty-one million, two hundred thirty-eight thousand, nine hundred seventy-four".