21188382113 has 8 divisors (see below), whose sum is σ = 21410320680. Its totient is φ = 20966515200.

The previous prime is 21188382097. The next prime is 21188382227. The reversal of 21188382113 is 31128388112.

It can be written as a sum of positive squares in 4 ways, for example, as 3148668769 + 18039713344 = 56113^2 + 134312^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21188382113 - 2⁴ = 21188382097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21188382613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745463 + ... + 773363.

It is an arithmetic number, because the mean of its divisors is an integer number (2676290085).

Almost surely, 2^21188382113 is an apocalyptic number.

It is an amenable number.

21188382113 is a deficient number, since it is larger than the sum of its proper divisors (221938567).

21188382113 is an equidigital number, since it uses as much as digits as its factorization.

21188382113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35827.

The product of its digits is 18432, while the sum is 38.

The spelling of 21188382113 in words is "twenty-one billion, one hundred eighty-eight million, three hundred eighty-two thousand, one hundred thirteen".