11111112111 has 32 divisors (see below), whose sum is σ = 16361452800. Its totient is φ = 6651072000.

The previous prime is 11111112091. The next prime is 11111112157. The reversal of 11111112111 is 11121111111.

It is not a de Polignac number, because 11111112111 - 2⁵ = 11111112079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111112191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1439340 + ... + 1447038.

It is an arithmetic number, because the mean of its divisors is an integer number (511295400).

Almost surely, 2^11111112111 is an apocalyptic number.

11111112111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111112111 is a deficient number, since it is larger than the sum of its proper divisors (5250340689).

11111112111 is a wasteful number, since it uses less digits than its factorization.

11111112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8247.

The product of its digits is 2, while the sum is 12.

Adding to 11111112111 its reverse (11121111111), we get a palindrome (22232223222).

It can be divided in two parts, 1111 and 1112111, that multiplied together give a palindrome (1235555321).

The spelling of 11111112111 in words is "eleven billion, one hundred eleven million, one hundred twelve thousand, one hundred eleven".