12101110991 has 2 divisors, whose sum is σ = 12101110992. Its totient is φ = 12101110990.

The previous prime is 12101110979. The next prime is 12101111017. The reversal of 12101110991 is 19901110121.

It is an a-pointer prime, because the next prime (12101111017) can be obtained adding 12101110991 to its sum of digits (26).

It is a weak prime.

It is an emirp because it is prime and its reverse (19901110121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12101110991 - 2²² = 12096916687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12101110991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12101110921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050555495 + 6050555496.

It is an arithmetic number, because the mean of its divisors is an integer number (6050555496).

Almost surely, 2^12101110991 is an apocalyptic number.

12101110991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101110991 is an equidigital number, since it uses as much as digits as its factorization.

12101110991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 26.

The spelling of 12101110991 in words is "twelve billion, one hundred one million, one hundred ten thousand, nine hundred ninety-one".