12421487717 has 2 divisors, whose sum is σ = 12421487718. Its totient is φ = 12421487716.

The previous prime is 12421487707. The next prime is 12421487723. The reversal of 12421487717 is 71778412421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10339025761 + 2082461956 = 101681^2 + 45634^2 .

It is a cyclic number.

It is not a de Polignac number, because 12421487717 - 2²⁶ = 12354378853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12421487707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210743858 + 6210743859.

It is an arithmetic number, because the mean of its divisors is an integer number (6210743859).

Almost surely, 2^12421487717 is an apocalyptic number.

It is an amenable number.

12421487717 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421487717 is an equidigital number, since it uses as much as digits as its factorization.

12421487717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 175616, while the sum is 44.

The spelling of 12421487717 in words is "twelve billion, four hundred twenty-one million, four hundred eighty-seven thousand, seven hundred seventeen".