11212222121209 has 2 divisors, whose sum is σ = 11212222121210. Its totient is φ = 11212222121208.

The previous prime is 11212222121207. The next prime is 11212222121213. The reversal of 11212222121209 is 90212122221211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7906061779984 + 3306160341225 = 2811772^2 + 1818285^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212222121209 - 2¹ = 11212222121207 is a prime.

Together with 11212222121207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11212222121207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606111060604 + 5606111060605.

It is an arithmetic number, because the mean of its divisors is an integer number (5606111060605).

Almost surely, 2^{11212222121209} is an apocalyptic number.

It is an amenable number.

11212222121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212222121209 is an equidigital number, since it uses as much as digits as its factorization.

11212222121209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 11212222121209 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred nine".