21158096 has 40 divisors (see below), whose sum is σ = 43747200. Its totient is φ = 9884160.

The previous prime is 21158063. The next prime is 21158119. The reversal of 21158096 is 69085112.

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, 23576 + ... + 24456.

It is an arithmetic number, because the mean of its divisors is an integer number (1093680).

Almost surely, 2^21158096 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21158096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21873600).

21158096 is an abundant number, since it is smaller than the sum of its proper divisors (22589104).

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

21158096 is a wasteful number, since it uses less digits than its factorization.

21158096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 21158096 is about 4599.7930388225. The cubic root of 21158096 is about 276.5830285399.

The spelling of 21158096 in words is "twenty-one million, one hundred fifty-eight thousand, ninety-six".