12219013861 has 2 divisors, whose sum is σ = 12219013862. Its totient is φ = 12219013860.

The previous prime is 12219013817. The next prime is 12219013913. The reversal of 12219013861 is 16831091221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8532216900 + 3686796961 = 92370^2 + 60719^2 .

It is a cyclic number.

It is not a de Polignac number, because 12219013861 - 2¹¹ = 12219011813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12219013801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109506930 + 6109506931.

It is an arithmetic number, because the mean of its divisors is an integer number (6109506931).

Almost surely, 2^12219013861 is an apocalyptic number.

It is an amenable number.

12219013861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12219013861 is an equidigital number, since it uses as much as digits as its factorization.

12219013861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 12219013861 in words is "twelve billion, two hundred nineteen million, thirteen thousand, eight hundred sixty-one".