21974648 has 16 divisors (see below), whose sum is σ = 41980680. Its totient is φ = 10779808.

The previous prime is 21974627. The next prime is 21974651. The reversal of 21974648 is 84647912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25490 + ... + 26337.

Almost surely, 2^21974648 is an apocalyptic number.

It is an amenable number.

21974648 is a deficient number, since it is larger than the sum of its proper divisors (20006032).

21974648 is a wasteful number, since it uses less digits than its factorization.

21974648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51886 (or 51882 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 21974648 is about 4687.7124485190. The cubic root of 21974648 is about 280.0962594208.

It can be divided in two parts, 21974 and 648, that added together give a palindrome (22622).

The spelling of 21974648 in words is "twenty-one million, nine hundred seventy-four thousand, six hundred forty-eight".