18213313113311 has 4 divisors (see below), whose sum is σ = 18244340904552. Its totient is φ = 18182285322072.

The previous prime is 18213313113257. The next prime is 18213313113337. The reversal of 18213313113311 is 11331131331281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18213313113311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213313113341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15513894740 + ... + 15513895913.

It is an arithmetic number, because the mean of its divisors is an integer number (4561085226138).

Almost surely, 2^{18213313113311} is an apocalyptic number.

18213313113311 is a deficient number, since it is larger than the sum of its proper divisors (31027791241).

18213313113311 is an equidigital number, since it uses as much as digits as its factorization.

18213313113311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31027791240.

The product of its digits is 3888, while the sum is 32.

Adding to 18213313113311 its reverse (11331131331281), we get a palindrome (29544444444592).

The spelling of 18213313113311 in words is "eighteen trillion, two hundred thirteen billion, three hundred thirteen million, one hundred thirteen thousand, three hundred eleven".