12445402217 has 2 divisors, whose sum is σ = 12445402218. Its totient is φ = 12445402216.

The previous prime is 12445402213. The next prime is 12445402231. The reversal of 12445402217 is 71220454421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7816504921 + 4628897296 = 88411^2 + 68036^2 .

It is a cyclic number.

It is not a de Polignac number, because 12445402217 - 2² = 12445402213 is a prime.

It is not a weakly prime, because it can be changed into another prime (12445402213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6222701108 + 6222701109.

It is an arithmetic number, because the mean of its divisors is an integer number (6222701109).

Almost surely, 2^12445402217 is an apocalyptic number.

It is an amenable number.

12445402217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12445402217 is an equidigital number, since it uses as much as digits as its factorization.

12445402217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 32.

Adding to 12445402217 its reverse (71220454421), we get a palindrome (83665856638).

The spelling of 12445402217 in words is "twelve billion, four hundred forty-five million, four hundred two thousand, two hundred seventeen".