10212112011991 has 2 divisors, whose sum is σ = 10212112011992. Its totient is φ = 10212112011990.

The previous prime is 10212112011961. The next prime is 10212112012087. The reversal of 10212112011991 is 19911021121201.

10212112011991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10212112011991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212112011901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106056005995 + 5106056005996.

It is an arithmetic number, because the mean of its divisors is an integer number (5106056005996).

Almost surely, 2^{10212112011991} is an apocalyptic number.

10212112011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212112011991 is an equidigital number, since it uses as much as digits as its factorization.

10212112011991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 31.

The spelling of 10212112011991 in words is "ten trillion, two hundred twelve billion, one hundred twelve million, eleven thousand, nine hundred ninety-one".