21331038 has 32 divisors (see below), whose sum is σ = 44669952. Its totient is φ = 6782400.

The previous prime is 21331021. The next prime is 21331043. The reversal of 21331038 is 83013312.

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 15 ways as a sum of consecutive naturals, for example, 12793 + ... + 14363.

It is an arithmetic number, because the mean of its divisors is an integer number (1395936).

Almost surely, 2^21331038 is an apocalyptic number.

21331038 is an abundant number, since it is smaller than the sum of its proper divisors (23338914).

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

21331038 is a wasteful number, since it uses less digits than its factorization.

21331038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21331038 is about 4618.5536697109. The cubic root of 21331038 is about 277.3345625382.

The spelling of 21331038 in words is "twenty-one million, three hundred thirty-one thousand, thirty-eight".