21974868 has 48 divisors (see below), whose sum is σ = 59976000. Its totient is φ = 6938784.

The previous prime is 21974851. The next prime is 21974881. The reversal of 21974868 is 86847912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3303 + ... + 7406.

It is an arithmetic number, because the mean of its divisors is an integer number (1249500).

Almost surely, 2^21974868 is an apocalyptic number.

It is an amenable number.

21974868 is an abundant number, since it is smaller than the sum of its proper divisors (38001132).

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

21974868 is a wasteful number, since it uses less digits than its factorization.

21974868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10741 (or 10733 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 21974868 is about 4687.7359140634. The cubic root of 21974868 is about 280.0971941490.

The spelling of 21974868 in words is "twenty-one million, nine hundred seventy-four thousand, eight hundred sixty-eight".