212100120010991 has 2 divisors, whose sum is σ = 212100120010992. Its totient is φ = 212100120010990.

The previous prime is 212100120010903. The next prime is 212100120011047. The reversal of 212100120010991 is 199010021001212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212100120010991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212100120010391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050060005495 + 106050060005496.

It is an arithmetic number, because the mean of its divisors is an integer number (106050060005496).

Almost surely, 2^{212100120010991} is an apocalyptic number.

212100120010991 is a deficient number, since it is larger than the sum of its proper divisors (1).

212100120010991 is an equidigital number, since it uses as much as digits as its factorization.

212100120010991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 212100120010991 in words is "two hundred twelve trillion, one hundred billion, one hundred twenty million, ten thousand, nine hundred ninety-one".