21853896 has 32 divisors (see below), whose sum is σ = 54777600. Its totient is φ = 7265600.

The previous prime is 21853889. The next prime is 21853913. The reversal of 21853896 is 69835812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10546 + ... + 12446.

It is an arithmetic number, because the mean of its divisors is an integer number (1711800).

Almost surely, 2^21853896 is an apocalyptic number.

It is an amenable number.

21853896 is an abundant number, since it is smaller than the sum of its proper divisors (32923704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21853896 is a wasteful number, since it uses less digits than its factorization.

21853896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389 (or 2385 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 21853896 is about 4674.8150765565. The cubic root of 21853896 is about 279.5822682528.

The spelling of 21853896 in words is "twenty-one million, eight hundred fifty-three thousand, eight hundred ninety-six".