121012011191 has 4 divisors (see below), whose sum is σ = 122371696800. Its totient is φ = 119652325584.

The previous prime is 121012011187. The next prime is 121012011227. The reversal of 121012011191 is 191110210121.

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 121012011191 - 2² = 121012011187 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 (121012013191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679842671 + ... + 679842848.

It is an arithmetic number, because the mean of its divisors is an integer number (30592924200).

Almost surely, 2^121012011191 is an apocalyptic number.

121012011191 is a deficient number, since it is larger than the sum of its proper divisors (1359685609).

121012011191 is an equidigital number, since it uses as much as digits as its factorization.

121012011191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359685608.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 121012011191 in words is "one hundred twenty-one billion, twelve million, eleven thousand, one hundred ninety-one".