12211784237789 has 2 divisors, whose sum is σ = 12211784237790. Its totient is φ = 12211784237788.

The previous prime is 12211784237749. The next prime is 12211784237833. The reversal of 12211784237789 is 98773248711221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6907592932900 + 5304191304889 = 2628230^2 + 2303083^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211784237789 - 2¹⁶ = 12211784172253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211784237749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105892118894 + 6105892118895.

It is an arithmetic number, because the mean of its divisors is an integer number (6105892118895).

Almost surely, 2^{12211784237789} is an apocalyptic number.

It is an amenable number.

12211784237789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211784237789 is an equidigital number, since it uses as much as digits as its factorization.

12211784237789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18966528, while the sum is 62.

The spelling of 12211784237789 in words is "twelve trillion, two hundred eleven billion, seven hundred eighty-four million, two hundred thirty-seven thousand, seven hundred eighty-nine".