11111100100111 has 4 divisors (see below), whose sum is σ = 12121200109224. Its totient is φ = 10101000091000.

The previous prime is 11111100100103. The next prime is 11111100100153. The reversal of 11111100100111 is 11100100111111.

It is a happy number.

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 11111100100111 - 2³ = 11111100100103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111100109111) 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, 505050004540 + ... + 505050004561.

It is an arithmetic number, because the mean of its divisors is an integer number (3030300027306).

Almost surely, 2^{11111100100111} is an apocalyptic number.

11111100100111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111100100111 is a deficient number, since it is larger than the sum of its proper divisors (1010100009113).

11111100100111 is a wasteful number, since it uses less digits than its factorization.

11111100100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010100009112.

The product of its (nonzero) digits is 1, while the sum is 10.

Adding to 11111100100111 its reverse (11100100111111), we get a palindrome (22211200211222).

It can be divided in two parts, 11111100 and 100111, that added together give a palindrome (11211211).

The spelling of 11111100100111 in words is "eleven trillion, one hundred eleven billion, one hundred million, one hundred thousand, one hundred eleven".