2111121019991 has 2 divisors, whose sum is σ = 2111121019992. Its totient is φ = 2111121019990.

The previous prime is 2111121019949. The next prime is 2111121020083. The reversal of 2111121019991 is 1999101211112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2111121019991 - 2³⁰ = 2110047278167 is a prime.

It is a super-2 number, since 2×2111121019991² (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 (2111121019291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055560509995 + 1055560509996.

It is an arithmetic number, because the mean of its divisors is an integer number (1055560509996).

Almost surely, 2^{2111121019991} is an apocalyptic number.

2111121019991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111121019991 is an equidigital number, since it uses as much as digits as its factorization.

2111121019991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 38.

The spelling of 2111121019991 in words is "two trillion, one hundred eleven billion, one hundred twenty-one million, nineteen thousand, nine hundred ninety-one".