210966968809 has 2 divisors, whose sum is σ = 210966968810. Its totient is φ = 210966968808.

The previous prime is 210966968783. The next prime is 210966968819. The reversal of 210966968809 is 908869669012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110271813184 + 100695155625 = 332072^2 + 317325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210966968809 is a prime.

It is not a weakly prime, because it can be changed into another prime (210966968819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105483484404 + 105483484405.

It is an arithmetic number, because the mean of its divisors is an integer number (105483484405).

Almost surely, 2^210966968809 is an apocalyptic number.

It is an amenable number.

210966968809 is a deficient number, since it is larger than the sum of its proper divisors (1).

210966968809 is an equidigital number, since it uses as much as digits as its factorization.

210966968809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20155392, while the sum is 64.

The spelling of 210966968809 in words is "two hundred ten billion, nine hundred sixty-six million, nine hundred sixty-eight thousand, eight hundred nine".