21838038 has 16 divisors (see below), whose sum is σ = 44292096. Its totient is φ = 7176680.

The previous prime is 21838027. The next prime is 21838057. The reversal of 21838038 is 83083812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25206 + ... + 26057.

It is an arithmetic number, because the mean of its divisors is an integer number (2768256).

Almost surely, 2^21838038 is an apocalyptic number.

21838038 is an abundant number, since it is smaller than the sum of its proper divisors (22454058).

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

21838038 is a wasteful number, since it uses less digits than its factorization.

21838038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51339.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 21838038 is about 4673.1186588830. The cubic root of 21838038 is about 279.5146267906.

The spelling of 21838038 in words is "twenty-one million, eight hundred thirty-eight thousand, thirty-eight".