11111121199 has 4 divisors (see below), whose sum is σ = 11111681200. Its totient is φ = 11110561200.

The previous prime is 11111121193. The next prime is 11111121209. The reversal of 11111121199 is 99112111111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111121199 - 2⁹ = 11111120687 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 (11111121193) 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, 249102 + ... + 290299.

It is an arithmetic number, because the mean of its divisors is an integer number (2777920300).

Almost surely, 2^11111121199 is an apocalyptic number.

11111121199 is a deficient number, since it is larger than the sum of its proper divisors (560001).

11111121199 is an equidigital number, since it uses as much as digits as its factorization.

11111121199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560000.

The product of its digits is 162, while the sum is 28.

The spelling of 11111121199 in words is "eleven billion, one hundred eleven million, one hundred twenty-one thousand, one hundred ninety-nine".