21853158 has 16 divisors (see below), whose sum is σ = 44041536. Its totient is φ = 7228520.

The previous prime is 21853147. The next prime is 21853213. The reversal of 21853158 is 85135812.

It is a happy number.

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, 13116 + ... + 14687.

It is an arithmetic number, because the mean of its divisors is an integer number (2752596).

Almost surely, 2^21853158 is an apocalyptic number.

21853158 is an abundant number, since it is smaller than the sum of its proper divisors (22188378).

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

21853158 is a wasteful number, since it uses less digits than its factorization.

21853158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27939.

The product of its digits is 9600, while the sum is 33.

The square root of 21853158 is about 4674.7361422865. The cubic root of 21853158 is about 279.5791210788.

The spelling of 21853158 in words is "twenty-one million, eight hundred fifty-three thousand, one hundred fifty-eight".