12001211208991 has 2 divisors, whose sum is σ = 12001211208992. Its totient is φ = 12001211208990.

The previous prime is 12001211208989. The next prime is 12001211208997. The reversal of 12001211208991 is 19980211210021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12001211208991 - 2¹ = 12001211208989 is a prime.

It is a super-2 number, since 2×12001211208991² (a number of 27 digits) contains 22 as substring.

Together with 12001211208989, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12001211208991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12001211208997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000605604495 + 6000605604496.

It is an arithmetic number, because the mean of its divisors is an integer number (6000605604496).

Almost surely, 2^{12001211208991} is an apocalyptic number.

12001211208991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001211208991 is an equidigital number, since it uses as much as digits as its factorization.

12001211208991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 12001211208991 in words is "twelve trillion, one billion, two hundred eleven million, two hundred eight thousand, nine hundred ninety-one".