2112121200991 has 2 divisors, whose sum is σ = 2112121200992. Its totient is φ = 2112121200990.

The previous prime is 2112121200967. The next prime is 2112121201031. The reversal of 2112121200991 is 1990021212112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2112121200991 is a prime.

It is a super-2 number, since 2×2112121200991² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112121200961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056060600495 + 1056060600496.

It is an arithmetic number, because the mean of its divisors is an integer number (1056060600496).

Almost surely, 2^{2112121200991} is an apocalyptic number.

2112121200991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112121200991 is an equidigital number, since it uses as much as digits as its factorization.

2112121200991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 2112121200991 in words is "two trillion, one hundred twelve billion, one hundred twenty-one million, two hundred thousand, nine hundred ninety-one".