210120012120917 has 2 divisors, whose sum is σ = 210120012120918. Its totient is φ = 210120012120916.

The previous prime is 210120012120883. The next prime is 210120012121009. The reversal of 210120012120917 is 719021210021012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199262980530916 + 10857031590001 = 14116054^2 + 3295001^2 .

It is a cyclic number.

It is not a de Polignac number, because 210120012120917 - 2¹² = 210120012116821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210120012120917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210120012120017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060006060458 + 105060006060459.

It is an arithmetic number, because the mean of its divisors is an integer number (105060006060459).

Almost surely, 2^{210120012120917} is an apocalyptic number.

It is an amenable number.

210120012120917 is a deficient number, since it is larger than the sum of its proper divisors (1).

210120012120917 is an equidigital number, since it uses as much as digits as its factorization.

210120012120917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

Adding to 210120012120917 its reverse (719021210021012), we get a palindrome (929141222141929).

The spelling of 210120012120917 in words is "two hundred ten trillion, one hundred twenty billion, twelve million, one hundred twenty thousand, nine hundred seventeen".