2100210120997 has 2 divisors, whose sum is σ = 2100210120998. Its totient is φ = 2100210120996.

The previous prime is 2100210120989. The next prime is 2100210121019. The reversal of 2100210120997 is 7990210120012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1554974084196 + 545236036801 = 1246986^2 + 738401^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100210120997 - 2³ = 2100210120989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100210120917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050105060498 + 1050105060499.

It is an arithmetic number, because the mean of its divisors is an integer number (1050105060499).

Almost surely, 2^{2100210120997} is an apocalyptic number.

It is an amenable number.

2100210120997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100210120997 is an equidigital number, since it uses as much as digits as its factorization.

2100210120997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 2100210120997 in words is "two trillion, one hundred billion, two hundred ten million, one hundred twenty thousand, nine hundred ninety-seven".