20172000217 has 2 divisors, whose sum is σ = 20172000218. Its totient is φ = 20172000216.

The previous prime is 20172000193. The next prime is 20172000221. The reversal of 20172000217 is 71200027102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18202327056 + 1969673161 = 134916^2 + 44381^2 .

It is a cyclic number.

It is not a de Polignac number, because 20172000217 - 2³¹ = 18024516569 is a prime.

It is not a weakly prime, because it can be changed into another prime (20172000257) 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, 10086000108 + 10086000109.

It is an arithmetic number, because the mean of its divisors is an integer number (10086000109).

Almost surely, 2^20172000217 is an apocalyptic number.

It is an amenable number.

20172000217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20172000217 is an equidigital number, since it uses as much as digits as its factorization.

20172000217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 22.

Adding to 20172000217 its reverse (71200027102), we get a palindrome (91372027319).

The spelling of 20172000217 in words is "twenty billion, one hundred seventy-two million, two hundred seventeen", and thus it is an aban number.