2100210100991 has 2 divisors, whose sum is σ = 2100210100992. Its totient is φ = 2100210100990.

The previous prime is 2100210100979. The next prime is 2100210101027. The reversal of 2100210100991 is 1990010120012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100210100991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2100210100991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100210100951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050105050495 + 1050105050496.

It is an arithmetic number, because the mean of its divisors is an integer number (1050105050496).

Almost surely, 2^{2100210100991} is an apocalyptic number.

2100210100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100210100991 is an equidigital number, since it uses as much as digits as its factorization.

2100210100991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 2100210100991 in words is "two trillion, one hundred billion, two hundred ten million, one hundred thousand, nine hundred ninety-one".