11111111110111 has 4 divisors (see below), whose sum is σ = 11764705881312. Its totient is φ = 10457516338912.

The previous prime is 11111111110097. The next prime is 11111111110133. The reversal of 11111111110111 is 11101111111111.

It is a happy number.

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

It is not a de Polignac number, because 11111111110111 - 2⁵ = 11111111110079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111111110091 and 11111111110100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111111119111) 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, 326797385575 + ... + 326797385608.

It is an arithmetic number, because the mean of its divisors is an integer number (2941176470328).

Almost surely, 2^{11111111110111} is an apocalyptic number.

11111111110111 is a deficient number, since it is larger than the sum of its proper divisors (653594771201).

11111111110111 is an equidigital number, since it uses as much as digits as its factorization.

11111111110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653594771200.

The product of its (nonzero) digits is 1, while the sum is 13.

Adding to 11111111110111 its reverse (11101111111111), we get a palindrome (22212222221222).

It can be divided in two parts, 1111111 and 1110111, that multiplied together give a palindrome (1233456543321).

The spelling of 11111111110111 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred ten thousand, one hundred eleven".