121211110000191 has 4 divisors (see below), whose sum is σ = 161614813333592. Its totient is φ = 80807406666792.

The previous prime is 121211110000163. The next prime is 121211110000237. The reversal of 121211110000191 is 191000011112121.

It is a happy number.

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

It is not a de Polignac number, because 121211110000191 - 2⁷ = 121211110000063 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 (121211110000151) 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, 20201851666696 + ... + 20201851666701.

It is an arithmetic number, because the mean of its divisors is an integer number (40403703333398).

Almost surely, 2^{121211110000191} is an apocalyptic number.

121211110000191 is a deficient number, since it is larger than the sum of its proper divisors (40403703333401).

121211110000191 is an equidigital number, since it uses as much as digits as its factorization.

121211110000191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40403703333400.

The product of its (nonzero) digits is 36, while the sum is 21.

The spelling of 121211110000191 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred ten million, one hundred ninety-one", and thus it is an aban number.