21838201318388 has 96 divisors (see below), whose sum is σ = 48967988966400. Its totient is φ = 8288251485696.

The previous prime is 21838201318363. The next prime is 21838201318429. The reversal of 21838201318388 is 88381310283812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4931228 + ... + 8245811.

It is an arithmetic number, because the mean of its divisors is an integer number (510083218400).

Almost surely, 2^{21838201318388} is an apocalyptic number.

21838201318388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21838201318388 is an abundant number, since it is smaller than the sum of its proper divisors (27129787648012).

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

21838201318388 is a wasteful number, since it uses less digits than its factorization.

21838201318388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13177249 (or 13177247 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 56.

The spelling of 21838201318388 in words is "twenty-one trillion, eight hundred thirty-eight billion, two hundred one million, three hundred eighteen thousand, three hundred eighty-eight".