2112021019991 has 2 divisors, whose sum is σ = 2112021019992. Its totient is φ = 2112021019990.

The previous prime is 2112021019981. The next prime is 2112021020089. The reversal of 2112021019991 is 1999101202112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2112021019991 - 2¹⁴ = 2112021003607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112021019921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056010509995 + 1056010509996.

It is an arithmetic number, because the mean of its divisors is an integer number (1056010509996).

Almost surely, 2^{2112021019991} is an apocalyptic number.

2112021019991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112021019991 is an equidigital number, since it uses as much as digits as its factorization.

2112021019991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 2112021019991 in words is "two trillion, one hundred twelve billion, twenty-one million, nineteen thousand, nine hundred ninety-one".