21411872 has 12 divisors (see below), whose sum is σ = 42154686. Its totient is φ = 10705920.

The previous prime is 21411869. The next prime is 21411883. The reversal of 21411872 is 27811412.

It can be written as a sum of positive squares in only one way, i.e., 18011536 + 3400336 = 4244^2 + 1844^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334529 + ... + 334592.

Almost surely, 2^21411872 is an apocalyptic number.

It is an amenable number.

21411872 is a deficient number, since it is larger than the sum of its proper divisors (20742814).

21411872 is an equidigital number, since it uses as much as digits as its factorization.

21411872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669131 (or 669123 counting only the distinct ones).

The product of its digits is 896, while the sum is 26.

The square root of 21411872 is about 4627.2964028685. The cubic root of 21411872 is about 277.6844408663.

The spelling of 21411872 in words is "twenty-one million, four hundred eleven thousand, eight hundred seventy-two".