121111011191 has 4 divisors (see below), whose sum is σ = 121121940072. Its totient is φ = 121100082312.

The previous prime is 121111011179. The next prime is 121111011199. The reversal of 121111011191 is 191110111121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121111011191 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 (121111011199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5447801 + ... + 5469986.

It is an arithmetic number, because the mean of its divisors is an integer number (30280485018).

Almost surely, 2^121111011191 is an apocalyptic number.

121111011191 is a deficient number, since it is larger than the sum of its proper divisors (10928881).

121111011191 is a wasteful number, since it uses less digits than its factorization.

121111011191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10928880.

The product of its (nonzero) digits is 18, while the sum is 20.

The spelling of 121111011191 in words is "one hundred twenty-one billion, one hundred eleven million, eleven thousand, one hundred ninety-one".