11111100111 has 48 divisors (see below), whose sum is σ = 16906173856. Its totient is φ = 7023034368.

The previous prime is 11111100089. The next prime is 11111100137. The reversal of 11111100111 is 11100111111.

It is not a de Polignac number, because 11111100111 - 2⁹ = 11111099599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

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 = 11111100093 and 11111100102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111100151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9636111 + ... + 9637263.

Almost surely, 2^11111100111 is an apocalyptic number.

11111100111 is a deficient number, since it is larger than the sum of its proper divisors (5795073745).

11111100111 is a wasteful number, since it uses less digits than its factorization.

11111100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912 (or 1909 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 9.

Adding to 11111100111 its reverse (11100111111), we get a palindrome (22211211222).

It can be divided in two parts, 111 and 11100111, that multiplied together give a palindrome (1232112321).

The spelling of 11111100111 in words is "eleven billion, one hundred eleven million, one hundred thousand, one hundred eleven".