12001020191 has 2 divisors, whose sum is σ = 12001020192. Its totient is φ = 12001020190.

The previous prime is 12001020181. The next prime is 12001020259. The reversal of 12001020191 is 19102010021.

It is a weak prime.

It is an emirp because it is prime and its reverse (19102010021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12001020191 - 2⁶ = 12001020127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12001020181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000510095 + 6000510096.

It is an arithmetic number, because the mean of its divisors is an integer number (6000510096).

Almost surely, 2^12001020191 is an apocalyptic number.

12001020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001020191 is an equidigital number, since it uses as much as digits as its factorization.

12001020191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 12001020191 in words is "twelve billion, one million, twenty thousand, one hundred ninety-one".