11218109931 has 48 divisors (see below), whose sum is σ = 19550224800. Its totient is φ = 6338255616.

The previous prime is 11218109927. The next prime is 11218109971. The reversal of 11218109931 is 13990181211.

It is not a de Polignac number, because 11218109931 - 2² = 11218109927 is a prime.

It is a super-2 number, since 2×11218109931² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11218109971) 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 47 ways as a sum of consecutive naturals, for example, 70111 + ... + 165383.

It is an arithmetic number, because the mean of its divisors is an integer number (407296350).

Almost surely, 2^11218109931 is an apocalyptic number.

11218109931 is a deficient number, since it is larger than the sum of its proper divisors (8332114869).

11218109931 is an equidigital number, since it uses as much as digits as its factorization.

11218109931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95385 (or 95372 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 36.

The spelling of 11218109931 in words is "eleven billion, two hundred eighteen million, one hundred nine thousand, nine hundred thirty-one".