1121121212209 has 2 divisors, whose sum is σ = 1121121212210. Its totient is φ = 1121121212208.

The previous prime is 1121121212203. The next prime is 1121121212219. The reversal of 1121121212209 is 9022121211211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 877401269809 + 243719942400 = 936697^2 + 493680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121121212209 - 2²⁹ = 1120584341297 is a prime.

It is a super-2 number, since 2×1121121212209² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1121121212203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560560606104 + 560560606105.

It is an arithmetic number, because the mean of its divisors is an integer number (560560606105).

Almost surely, 2^{1121121212209} is an apocalyptic number.

It is an amenable number.

1121121212209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121121212209 is an equidigital number, since it uses as much as digits as its factorization.

1121121212209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 1121121212209 in words is "one trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred nine".