Adding to 111100100111111 its reverse (111111001001111), we get a palindrome (222211101112222).
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-111100100111111 is a prime.
It is a Duffinian number.
It is a congruent number.
Almost surely, 2111100100111111 is an apocalyptic number.
111100100111111 is an equidigital number, since it uses as much as digits as its factorization.
111100100111111 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 983186726760.
The spelling of 111100100111111 in words is "one hundred eleven trillion, one hundred billion, one hundred million, one hundred eleven thousand, one hundred eleven".