121123212209 has 2 divisors, whose sum is σ = 121123212210. Its totient is φ = 121123212208.

The previous prime is 121123212193. The next prime is 121123212253. The reversal of 121123212209 is 902212321121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65048972209 + 56074240000 = 255047^2 + 236800^2 .

It is an emirp because it is prime and its reverse (902212321121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121123212209 - 2⁴ = 121123212193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121123212299) 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, 60561606104 + 60561606105.

It is an arithmetic number, because the mean of its divisors is an integer number (60561606105).

Almost surely, 2^121123212209 is an apocalyptic number.

It is an amenable number.

121123212209 is a deficient number, since it is larger than the sum of its proper divisors (1).

121123212209 is an equidigital number, since it uses as much as digits as its factorization.

121123212209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 121123212209 in words is "one hundred twenty-one billion, one hundred twenty-three million, two hundred twelve thousand, two hundred nine".