111100109999 has 4 divisors (see below), whose sum is σ = 112758320664. Its totient is φ = 109441899336.

The previous prime is 111100109993. The next prime is 111100110061. The reversal of 111100109999 is 999901001111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999901001111 = 4337 ⋅230551303.

It is a cyclic number.

It is not a de Polignac number, because 111100109999 - 2¹² = 111100105903 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 (111100109993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829105232 + ... + 829105365.

It is an arithmetic number, because the mean of its divisors is an integer number (28189580166).

Almost surely, 2^111100109999 is an apocalyptic number.

111100109999 is a deficient number, since it is larger than the sum of its proper divisors (1658210665).

111100109999 is an equidigital number, since it uses as much as digits as its factorization.

111100109999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658210664.

The product of its (nonzero) digits is 6561, while the sum is 41.

The spelling of 111100109999 in words is "one hundred eleven billion, one hundred million, one hundred nine thousand, nine hundred ninety-nine".