1212101111209 has 2 divisors, whose sum is σ = 1212101111210. Its totient is φ = 1212101111208.

The previous prime is 1212101111173. The next prime is 1212101111219. The reversal of 1212101111209 is 9021111012121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1183733120025 + 28367991184 = 1087995^2 + 168428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212101111209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212101111209.

It is not a weakly prime, because it can be changed into another prime (1212101111219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606050555604 + 606050555605.

It is an arithmetic number, because the mean of its divisors is an integer number (606050555605).

Almost surely, 2^{1212101111209} is an apocalyptic number.

It is an amenable number.

1212101111209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212101111209 is an equidigital number, since it uses as much as digits as its factorization.

1212101111209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 1212101111209 in words is "one trillion, two hundred twelve billion, one hundred one million, one hundred eleven thousand, two hundred nine".