20021223317 has 2 divisors, whose sum is σ = 20021223318. Its totient is φ = 20021223316.

The previous prime is 20021223311. The next prime is 20021223349. The reversal of 20021223317 is 71332212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19581524356 + 439698961 = 139934^2 + 20969^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021223317 - 2¹⁰ = 20021222293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021223292 and 20021223301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021223311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010611658 + 10010611659.

It is an arithmetic number, because the mean of its divisors is an integer number (10010611659).

Almost surely, 2^20021223317 is an apocalyptic number.

It is an amenable number.

20021223317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021223317 is an equidigital number, since it uses as much as digits as its factorization.

20021223317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

Adding to 20021223317 its reverse (71332212002), we get a palindrome (91353435319).

The spelling of 20021223317 in words is "twenty billion, twenty-one million, two hundred twenty-three thousand, three hundred seventeen".