21885374 has 16 divisors (see below), whose sum is σ = 39149568. Its totient is φ = 8971512.

The previous prime is 21885373. The next prime is 21885407. The reversal of 21885374 is 47358812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21885371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33662 + ... + 34305.

It is an arithmetic number, because the mean of its divisors is an integer number (2446848).

Almost surely, 2^21885374 is an apocalyptic number.

21885374 is a deficient number, since it is larger than the sum of its proper divisors (17264194).

21885374 is a wasteful number, since it uses less digits than its factorization.

21885374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67999.

The product of its digits is 53760, while the sum is 38.

The square root of 21885374 is about 4678.1806292618. The cubic root of 21885374 is about 279.7164391204.

The spelling of 21885374 in words is "twenty-one million, eight hundred eighty-five thousand, three hundred seventy-four".