21120221185838 has 16 divisors (see below), whose sum is σ = 31771740672000. Its totient is φ = 10529646819672.

The previous prime is 21120221185837. The next prime is 21120221185841. The reversal of 21120221185838 is 83858112202112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120221185837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5777483 + ... + 8695961.

It is an arithmetic number, because the mean of its divisors is an integer number (1985733792000).

Almost surely, 2^{21120221185838} is an apocalyptic number.

21120221185838 is a deficient number, since it is larger than the sum of its proper divisors (10651519486162).

21120221185838 is a wasteful number, since it uses less digits than its factorization.

21120221185838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928919.

The product of its (nonzero) digits is 122880, while the sum is 44.

The spelling of 21120221185838 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, one hundred eighty-five thousand, eight hundred thirty-eight".