111222011999 has 4 divisors (see below), whose sum is σ = 127110870864. Its totient is φ = 95333153136.

The previous prime is 111222011933. The next prime is 111222012001. The reversal of 111222011999 is 999110222111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999110222111 = 409 ⋅2442812279.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111222011999 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 (111222011399) 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, 7944429422 + ... + 7944429435.

It is an arithmetic number, because the mean of its divisors is an integer number (31777717716).

Almost surely, 2^111222011999 is an apocalyptic number.

111222011999 is a deficient number, since it is larger than the sum of its proper divisors (15888858865).

111222011999 is an equidigital number, since it uses as much as digits as its factorization.

111222011999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15888858864.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 111222011999 in words is "one hundred eleven billion, two hundred twenty-two million, eleven thousand, nine hundred ninety-nine".