17221319917 has 2 divisors, whose sum is σ = 17221319918. Its totient is φ = 17221319916.

The previous prime is 17221319911. The next prime is 17221319933. The reversal of 17221319917 is 71991312271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16163053956 + 1058265961 = 127134^2 + 32531^2 .

It is a cyclic number.

It is not a de Polignac number, because 17221319917 - 2⁷ = 17221319789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17221319911) 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, 8610659958 + 8610659959.

It is an arithmetic number, because the mean of its divisors is an integer number (8610659959).

Almost surely, 2^17221319917 is an apocalyptic number.

It is an amenable number.

17221319917 is a deficient number, since it is larger than the sum of its proper divisors (1).

17221319917 is an equidigital number, since it uses as much as digits as its factorization.

17221319917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 43.

The spelling of 17221319917 in words is "seventeen billion, two hundred twenty-one million, three hundred nineteen thousand, nine hundred seventeen".