121201200000191 has 2 divisors, whose sum is σ = 121201200000192. Its totient is φ = 121201200000190.

The previous prime is 121201200000163. The next prime is 121201200000247. The reversal of 121201200000191 is 191000002102121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121201200000191 - 2¹⁴ = 121201199983807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121201200000121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600600000095 + 60600600000096.

It is an arithmetic number, because the mean of its divisors is an integer number (60600600000096).

Almost surely, 2^{121201200000191} is an apocalyptic number.

121201200000191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201200000191 is an equidigital number, since it uses as much as digits as its factorization.

121201200000191 is an evil number, because the sum of its binary digits is even.

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

The spelling of 121201200000191 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred million, one hundred ninety-one", and thus it is an aban number.