20123213317 has 2 divisors, whose sum is σ = 20123213318. Its totient is φ = 20123213316.

The previous prime is 20123213287. The next prime is 20123213339. The reversal of 20123213317 is 71331232102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20086259076 + 36954241 = 141726^2 + 6079^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123213317 - 2⁷ = 20123213189 is a prime.

It is a super-4 number, since 4×20123213317⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 20123213291 and 20123213300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123213017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061606658 + 10061606659.

It is an arithmetic number, because the mean of its divisors is an integer number (10061606659).

Almost surely, 2^20123213317 is an apocalyptic number.

It is an amenable number.

20123213317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123213317 is an equidigital number, since it uses as much as digits as its factorization.

20123213317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 20123213317 its reverse (71331232102), we get a palindrome (91454445419).

The spelling of 20123213317 in words is "twenty billion, one hundred twenty-three million, two hundred thirteen thousand, three hundred seventeen".