1222216172209 has 2 divisors, whose sum is σ = 1222216172210. Its totient is φ = 1222216172208.

The previous prime is 1222216172171. The next prime is 1222216172213. The reversal of 1222216172209 is 9022716122221.

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., 789716595600 + 432499576609 = 888660^2 + 657647^2 .

It is an emirp because it is prime and its reverse (9022716122221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1222216172209 - 2¹³ = 1222216164017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222216172299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611108086104 + 611108086105.

It is an arithmetic number, because the mean of its divisors is an integer number (611108086105).

Almost surely, 2^{1222216172209} is an apocalyptic number.

It is an amenable number.

1222216172209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222216172209 is an equidigital number, since it uses as much as digits as its factorization.

1222216172209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 1222216172209 in words is "one trillion, two hundred twenty-two billion, two hundred sixteen million, one hundred seventy-two thousand, two hundred nine".