21853268 has 24 divisors (see below), whose sum is σ = 40410720. Its totient is φ = 10311840.

The previous prime is 21853231. The next prime is 21853309. The reversal of 21853268 is 86235812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31655 + ... + 32337.

It is an arithmetic number, because the mean of its divisors is an integer number (1683780).

Almost surely, 2^21853268 is an apocalyptic number.

It is an amenable number.

21853268 is a deficient number, since it is larger than the sum of its proper divisors (18557452).

21853268 is a wasteful number, since it uses less digits than its factorization.

21853268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127 (or 1125 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 21853268 is about 4674.7479076417. The cubic root of 21853268 is about 279.5795901743.

The spelling of 21853268 in words is "twenty-one million, eight hundred fifty-three thousand, two hundred sixty-eight".