11111100011111 has 4 divisors (see below), whose sum is σ = 11369497685832. Its totient is φ = 10852702336392.

The previous prime is 11111100011101. The next prime is 11111100011183. The reversal of 11111100011111 is 11111000111111.

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

It is a cyclic number.

It is not a de Polignac number, because 11111100011111 - 2¹⁴ = 11111099994727 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 11111100011092 and 11111100011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111100011101) 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 3 ways as a sum of consecutive naturals, for example, 129198837296 + ... + 129198837381.

It is an arithmetic number, because the mean of its divisors is an integer number (2842374421458).

Almost surely, 2^{11111100011111} is an apocalyptic number.

11111100011111 is a deficient number, since it is larger than the sum of its proper divisors (258397674721).

11111100011111 is an equidigital number, since it uses as much as digits as its factorization.

11111100011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258397674720.

The product of its (nonzero) digits is 1, while the sum is 11.

Adding to 11111100011111 its reverse (11111000111111), we get a palindrome (22222100122222).

The spelling of 11111100011111 in words is "eleven trillion, one hundred eleven billion, one hundred million, eleven thousand, one hundred eleven".