12581021317 has 2 divisors, whose sum is σ = 12581021318. Its totient is φ = 12581021316.

The previous prime is 12581021287. The next prime is 12581021363. The reversal of 12581021317 is 71312018521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8671520641 + 3909500676 = 93121^2 + 62526^2 .

It is a cyclic number.

It is not a de Polignac number, because 12581021317 - 2¹⁵ = 12580988549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12581027317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6290510658 + 6290510659.

It is an arithmetic number, because the mean of its divisors is an integer number (6290510659).

Almost surely, 2^12581021317 is an apocalyptic number.

It is an amenable number.

12581021317 is a deficient number, since it is larger than the sum of its proper divisors (1).

12581021317 is an equidigital number, since it uses as much as digits as its factorization.

12581021317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 31.

Adding to 12581021317 its reverse (71312018521), we get a palindrome (83893039838).

The spelling of 12581021317 in words is "twelve billion, five hundred eighty-one million, twenty-one thousand, three hundred seventeen".