12012105817 has 2 divisors, whose sum is σ = 12012105818. Its totient is φ = 12012105816.

The previous prime is 12012105811. The next prime is 12012105821. The reversal of 12012105817 is 71850121021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10180608201 + 1831497616 = 100899^2 + 42796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12012105817 is a prime.

It is not a weakly prime, because it can be changed into another prime (12012105811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006052908 + 6006052909.

It is an arithmetic number, because the mean of its divisors is an integer number (6006052909).

Almost surely, 2^12012105817 is an apocalyptic number.

It is an amenable number.

12012105817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012105817 is an equidigital number, since it uses as much as digits as its factorization.

12012105817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 28.

Adding to 12012105817 its reverse (71850121021), we get a palindrome (83862226838).

The spelling of 12012105817 in words is "twelve billion, twelve million, one hundred five thousand, eight hundred seventeen".