2111220100991 has 2 divisors, whose sum is σ = 2111220100992. Its totient is φ = 2111220100990.

The previous prime is 2111220100981. The next prime is 2111220101063. The reversal of 2111220100991 is 1990010221112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2111220100991 - 2²⁶ = 2111152992127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111220100981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055610050495 + 1055610050496.

It is an arithmetic number, because the mean of its divisors is an integer number (1055610050496).

Almost surely, 2^{2111220100991} is an apocalyptic number.

2111220100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111220100991 is an equidigital number, since it uses as much as digits as its factorization.

2111220100991 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 29.

The spelling of 2111220100991 in words is "two trillion, one hundred eleven billion, two hundred twenty million, one hundred thousand, nine hundred ninety-one".