12001001199991 has 2 divisors, whose sum is σ = 12001001199992. Its totient is φ = 12001001199990.

The previous prime is 12001001199947. The next prime is 12001001200061. The reversal of 12001001199991 is 19999110010021.

It is a weak prime.

It is an emirp because it is prime and its reverse (19999110010021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12001001199991 - 2¹⁷ = 12001001068919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12001001190991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000500599995 + 6000500599996.

It is an arithmetic number, because the mean of its divisors is an integer number (6000500599996).

Almost surely, 2^{12001001199991} is an apocalyptic number.

12001001199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001001199991 is an equidigital number, since it uses as much as digits as its factorization.

12001001199991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 43.

The spelling of 12001001199991 in words is "twelve trillion, one billion, one million, one hundred ninety-nine thousand, nine hundred ninety-one".