121111111199 has 16 divisors (see below), whose sum is σ = 131209878240. Its totient is φ = 111125468160.

The previous prime is 121111111183. The next prime is 121111111211. The reversal of 121111111199 is 991111111121.

It is a cyclic number.

It is not a de Polignac number, because 121111111199 - 2⁴ = 121111111183 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 (121111111129) 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 15 ways as a sum of consecutive naturals, for example, 2191799 + ... + 2246375.

It is an arithmetic number, because the mean of its divisors is an integer number (8200617390).

Almost surely, 2^121111111199 is an apocalyptic number.

121111111199 is a deficient number, since it is larger than the sum of its proper divisors (10098767041).

121111111199 is a wasteful number, since it uses less digits than its factorization.

121111111199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55610.

The product of its digits is 162, while the sum is 29.

The spelling of 121111111199 in words is "one hundred twenty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred ninety-nine".