20201223210317 has 2 divisors, whose sum is σ = 20201223210318. Its totient is φ = 20201223210316.

The previous prime is 20201223210299. The next prime is 20201223210323. The reversal of 20201223210317 is 71301232210202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13537292641636 + 6663930568681 = 3679306^2 + 2581459^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201223210317 - 2¹⁸ = 20201222948173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201223210347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100611605158 + 10100611605159.

It is an arithmetic number, because the mean of its divisors is an integer number (10100611605159).

Almost surely, 2^{20201223210317} is an apocalyptic number.

It is an amenable number.

20201223210317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201223210317 is an equidigital number, since it uses as much as digits as its factorization.

20201223210317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 20201223210317 its reverse (71301232210202), we get a palindrome (91502455420519).

The spelling of 20201223210317 in words is "twenty trillion, two hundred one billion, two hundred twenty-three million, two hundred ten thousand, three hundred seventeen".