111100111121999 has 2 divisors, whose sum is σ = 111100111122000. Its totient is φ = 111100111121998.

The previous prime is 111100111121981. The next prime is 111100111122017. The reversal of 111100111121999 is 999121111001111.

It is a balanced prime because it is at equal distance from previous prime (111100111121981) and next prime (111100111122017).

It is a cyclic number.

It is not a de Polignac number, because 111100111121999 - 2²⁰ = 111100110073423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111100110121999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550055560999 + 55550055561000.

It is an arithmetic number, because the mean of its divisors is an integer number (55550055561000).

Almost surely, 2^{111100111121999} is an apocalyptic number.

111100111121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100111121999 is an equidigital number, since it uses as much as digits as its factorization.

111100111121999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 38.

The spelling of 111100111121999 in words is "one hundred eleven trillion, one hundred billion, one hundred eleven million, one hundred twenty-one thousand, nine hundred ninety-nine".