12121200191 has 2 divisors, whose sum is σ = 12121200192. Its totient is φ = 12121200190.

The previous prime is 12121200187. The next prime is 12121200197. The reversal of 12121200191 is 19100212121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12121200191 - 2² = 12121200187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121200197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060600095 + 6060600096.

It is an arithmetic number, because the mean of its divisors is an integer number (6060600096).

Almost surely, 2^12121200191 is an apocalyptic number.

12121200191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121200191 is an equidigital number, since it uses as much as digits as its factorization.

12121200191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 12121200191 in words is "twelve billion, one hundred twenty-one million, two hundred thousand, one hundred ninety-one".