210996015817 has 2 divisors, whose sum is σ = 210996015818. Its totient is φ = 210996015816.

The previous prime is 210996015751. The next prime is 210996015823. The reversal of 210996015817 is 718510699012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192155982736 + 18840033081 = 438356^2 + 137259^2 .

It is a cyclic number.

It is not a de Polignac number, because 210996015817 - 2²⁷ = 210861798089 is a prime.

It is not a weakly prime, because it can be changed into another prime (210996015877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105498007908 + 105498007909.

It is an arithmetic number, because the mean of its divisors is an integer number (105498007909).

Almost surely, 2^210996015817 is an apocalyptic number.

It is an amenable number.

210996015817 is a deficient number, since it is larger than the sum of its proper divisors (1).

210996015817 is an equidigital number, since it uses as much as digits as its factorization.

210996015817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 49.

The spelling of 210996015817 in words is "two hundred ten billion, nine hundred ninety-six million, fifteen thousand, eight hundred seventeen".