21038384 has 20 divisors (see below), whose sum is σ = 43160184. Its totient is φ = 9900288.

The previous prime is 21038363. The next prime is 21038389. The reversal of 21038384 is 48383012.

It is a happy number.

It is a super-2 number, since 2×21038384² = 885227202662912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21038389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38402 + ... + 38945.

Almost surely, 2^21038384 is an apocalyptic number.

It is an amenable number.

21038384 is an abundant number, since it is smaller than the sum of its proper divisors (22121800).

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

21038384 is a wasteful number, since it uses less digits than its factorization.

21038384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77372 (or 77366 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 21038384 is about 4586.7618207184. The cubic root of 21038384 is about 276.0604082575.

The spelling of 21038384 in words is "twenty-one million, thirty-eight thousand, three hundred eighty-four".