21975224 has 16 divisors (see below), whose sum is σ = 41254920. Its totient is φ = 10973920.

The previous prime is 21975167. The next prime is 21975287. The reversal of 21975224 is 42257912.

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, 9194 + ... + 11334.

Almost surely, 2^21975224 is an apocalyptic number.

It is an amenable number.

21975224 is a deficient number, since it is larger than the sum of its proper divisors (19279696).

21975224 is a wasteful number, since it uses less digits than its factorization.

21975224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430 (or 3426 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 21975224 is about 4687.7738853319. The cubic root of 21975224 is about 280.0987066960.

The spelling of 21975224 in words is "twenty-one million, nine hundred seventy-five thousand, two hundred twenty-four".