21904882 has 8 divisors (see below), whose sum is σ = 32882652. Its totient is φ = 10944000.

The previous prime is 21904877. The next prime is 21904943. The reversal of 21904882 is 28840912.

It can be written as a sum of positive squares in 2 ways, for example, as 16801801 + 5103081 = 4099^2 + 2259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 219 + ... + 6622.

Almost surely, 2^21904882 is an apocalyptic number.

21904882 is a deficient number, since it is larger than the sum of its proper divisors (10977770).

21904882 is a wasteful number, since it uses less digits than its factorization.

21904882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8444.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 21904882 is about 4680.2651634282. The cubic root of 21904882 is about 279.7995248649.

The spelling of 21904882 in words is "twenty-one million, nine hundred four thousand, eight hundred eighty-two".