9912123362209 has 2 divisors, whose sum is σ = 9912123362210. Its totient is φ = 9912123362208.

The previous prime is 9912123362191. The next prime is 9912123362213. The reversal of 9912123362209 is 9022633212199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9578158419600 + 333964942609 = 3094860^2 + 577897^2 .

It is a cyclic number.

It is not a de Polignac number, because 9912123362209 - 2¹⁵ = 9912123329441 is a prime.

It is not a weakly prime, because it can be changed into another prime (9912123363209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956061681104 + 4956061681105.

It is an arithmetic number, because the mean of its divisors is an integer number (4956061681105).

Almost surely, 2^{9912123362209} is an apocalyptic number.

It is an amenable number.

9912123362209 is a deficient number, since it is larger than the sum of its proper divisors (1).

9912123362209 is an equidigital number, since it uses as much as digits as its factorization.

9912123362209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 49.

The spelling of 9912123362209 in words is "nine trillion, nine hundred twelve billion, one hundred twenty-three million, three hundred sixty-two thousand, two hundred nine".