11111200111 has 24 divisors (see below), whose sum is σ = 12941155584. Its totient is φ = 9456107760.

The previous prime is 11111200097. The next prime is 11111200117. The reversal of 11111200111 is 11100211111.

It is a de Polignac number, because none of the positive numbers 2^k-11111200111 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 (11111200117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253180 + ... + 293806.

It is an arithmetic number, because the mean of its divisors is an integer number (539214816).

Almost surely, 2^11111200111 is an apocalyptic number.

11111200111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111200111 is a deficient number, since it is larger than the sum of its proper divisors (1829955473).

11111200111 is a wasteful number, since it uses less digits than its factorization.

11111200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40731 (or 40708 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 11111200111 its reverse (11100211111), we get a palindrome (22211411222).

The spelling of 11111200111 in words is "eleven billion, one hundred eleven million, two hundred thousand, one hundred eleven".