12661219211 has 2 divisors, whose sum is σ = 12661219212. Its totient is φ = 12661219210.

The previous prime is 12661219189. The next prime is 12661219223. The reversal of 12661219211 is 11291216621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12661219211 is a prime.

It is not a weakly prime, because it can be changed into another prime (12661219261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330609605 + 6330609606.

It is an arithmetic number, because the mean of its divisors is an integer number (6330609606).

Almost surely, 2^12661219211 is an apocalyptic number.

12661219211 is a deficient number, since it is larger than the sum of its proper divisors (1).

12661219211 is an equidigital number, since it uses as much as digits as its factorization.

12661219211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The spelling of 12661219211 in words is "twelve billion, six hundred sixty-one million, two hundred nineteen thousand, two hundred eleven".