12221312817 has 16 divisors (see below), whose sum is σ = 18661847040. Its totient is φ = 6969022032.

The previous prime is 12221312813. The next prime is 12221312819. The reversal of 12221312817 is 71821312221.

It is not a de Polignac number, because 12221312817 - 2² = 12221312813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12221312813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 597423 + ... + 617540.

It is an arithmetic number, because the mean of its divisors is an integer number (1166365440).

Almost surely, 2^12221312817 is an apocalyptic number.

It is an amenable number.

12221312817 is a deficient number, since it is larger than the sum of its proper divisors (6440534223).

12221312817 is a wasteful number, since it uses less digits than its factorization.

12221312817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215452.

The product of its digits is 2688, while the sum is 30.

The spelling of 12221312817 in words is "twelve billion, two hundred twenty-one million, three hundred twelve thousand, eight hundred seventeen".