12216179909 has 2 divisors, whose sum is σ = 12216179910. Its totient is φ = 12216179908.

The previous prime is 12216179897. The next prime is 12216179939. The reversal of 12216179909 is 90997161221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6831849025 + 5384330884 = 82655^2 + 73378^2 .

It is a cyclic number.

It is not a de Polignac number, because 12216179909 - 2⁸ = 12216179653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12216179939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108089954 + 6108089955.

It is an arithmetic number, because the mean of its divisors is an integer number (6108089955).

Almost surely, 2^12216179909 is an apocalyptic number.

It is an amenable number.

12216179909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12216179909 is an equidigital number, since it uses as much as digits as its factorization.

12216179909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 47.

The spelling of 12216179909 in words is "twelve billion, two hundred sixteen million, one hundred seventy-nine thousand, nine hundred nine".