21975472 has 20 divisors (see below), whose sum is σ = 42820920. Its totient is φ = 10924928.

The previous prime is 21975463. The next prime is 21975487. The reversal of 21975472 is 27457912.

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, 973 + ... + 6700.

It is an arithmetic number, because the mean of its divisors is an integer number (2141046).

Almost surely, 2^21975472 is an apocalyptic number.

It is an amenable number.

21975472 is a deficient number, since it is larger than the sum of its proper divisors (20845448).

21975472 is a wasteful number, since it uses less digits than its factorization.

21975472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7860 (or 7854 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The square root of 21975472 is about 4687.8003370451. The cubic root of 21975472 is about 280.0997603708.

The spelling of 21975472 in words is "twenty-one million, nine hundred seventy-five thousand, four hundred seventy-two".