21184868 has 12 divisors (see below), whose sum is σ = 38075772. Its totient is φ = 10306080.

The previous prime is 21184859. The next prime is 21184903. The reversal of 21184868 is 86848112.

It can be written as a sum of positive squares in 2 ways, for example, as 18335524 + 2849344 = 4282^2 + 1688^2 .

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, 71423 + ... + 71718.

It is an arithmetic number, because the mean of its divisors is an integer number (3172981).

Almost surely, 2^21184868 is an apocalyptic number.

It is an amenable number.

21184868 is a deficient number, since it is larger than the sum of its proper divisors (16890904).

21184868 is a wasteful number, since it uses less digits than its factorization.

21184868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143182 (or 143180 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 21184868 is about 4602.7022497659. The cubic root of 21184868 is about 276.6996357543.

The spelling of 21184868 in words is "twenty-one million, one hundred eighty-four thousand, eight hundred sixty-eight".