21895472 has 10 divisors (see below), whose sum is σ = 42422508. Its totient is φ = 10947728.

The previous prime is 21895469. The next prime is 21895481. The reversal of 21895472 is 27459812.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684218 + ... + 684249.

Almost surely, 2^21895472 is an apocalyptic number.

It is an amenable number.

21895472 is a deficient number, since it is larger than the sum of its proper divisors (20527036).

21895472 is a wasteful number, since it uses less digits than its factorization.

21895472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368475 (or 1368469 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 21895472 is about 4679.2597705193. The cubic root of 21895472 is about 279.7594532705.

The spelling of 21895472 in words is "twenty-one million, eight hundred ninety-five thousand, four hundred seventy-two".