111911109211 has 24 divisors (see below), whose sum is σ = 127562388480. Its totient is φ = 97267268400.

The previous prime is 111911109181. The next prime is 111911109229. The reversal of 111911109211 is 112901119111.

It is not a de Polignac number, because 111911109211 - 2⁵ = 111911109179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111911109211.

It is not an unprimeable number, because it can be changed into a prime (111911109281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2325330 + ... + 2372968.

It is an arithmetic number, because the mean of its divisors is an integer number (5315099520).

Almost surely, 2^111911109211 is an apocalyptic number.

111911109211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111911109211 is a deficient number, since it is larger than the sum of its proper divisors (15651279269).

111911109211 is an equidigital number, since it uses as much as digits as its factorization.

111911109211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47847 (or 47764 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 28.

It can be divided in two parts, 111911 and 109211, that multiplied together give a palindrome (12221912221).

The spelling of 111911109211 in words is "one hundred eleven billion, nine hundred eleven million, one hundred nine thousand, two hundred eleven".