12021122109991 has 2 divisors, whose sum is σ = 12021122109992. Its totient is φ = 12021122109990.

The previous prime is 12021122109967. The next prime is 12021122110027. The reversal of 12021122109991 is 19990122112021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12021122109991 - 2¹³ = 12021122101799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021122109901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010561054995 + 6010561054996.

It is an arithmetic number, because the mean of its divisors is an integer number (6010561054996).

Almost surely, 2^{12021122109991} is an apocalyptic number.

12021122109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021122109991 is an equidigital number, since it uses as much as digits as its factorization.

12021122109991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 12021122109991 in words is "twelve trillion, twenty-one billion, one hundred twenty-two million, one hundred nine thousand, nine hundred ninety-one".