21238086 has 16 divisors (see below), whose sum is σ = 44712000. Its totient is φ = 6706728.

The previous prime is 21238073. The next prime is 21238093. The reversal of 21238086 is 68083212.

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, 93036 + ... + 93263.

It is an arithmetic number, because the mean of its divisors is an integer number (2794500).

Almost surely, 2^21238086 is an apocalyptic number.

21238086 is an abundant number, since it is smaller than the sum of its proper divisors (23473914).

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

21238086 is a wasteful number, since it uses less digits than its factorization.

21238086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186323.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21238086 is about 4608.4797927299. The cubic root of 21238086 is about 276.9311388560.

The spelling of 21238086 in words is "twenty-one million, two hundred thirty-eight thousand, eighty-six".