21158076 has 12 divisors (see below), whose sum is σ = 49368872. Its totient is φ = 7052688.

The previous prime is 21158063. The next prime is 21158119. The reversal of 21158076 is 67085112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 881575 + ... + 881598.

Almost surely, 2^21158076 is an apocalyptic number.

It is an amenable number.

21158076 is an abundant number, since it is smaller than the sum of its proper divisors (28210796).

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

21158076 is a wasteful number, since it uses less digits than its factorization.

21158076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763180 (or 1763178 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 21158076 is about 4599.7908648111. The cubic root of 21158076 is about 276.5829413918.

The spelling of 21158076 in words is "twenty-one million, one hundred fifty-eight thousand, seventy-six".