121212110209 has 2 divisors, whose sum is σ = 121212110210. Its totient is φ = 121212110208.

The previous prime is 121212110207. The next prime is 121212110213. The reversal of 121212110209 is 902011212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88984679809 + 32227430400 = 298303^2 + 179520^2 .

It is a cyclic number.

It is not a de Polignac number, because 121212110209 - 2¹ = 121212110207 is a prime.

It is a super-2 number, since 2×121212110209² (a number of 23 digits) contains 22 as substring.

Together with 121212110207, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121212110209.

It is not a weakly prime, because it can be changed into another prime (121212110207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606055104 + 60606055105.

It is an arithmetic number, because the mean of its divisors is an integer number (60606055105).

Almost surely, 2^121212110209 is an apocalyptic number.

It is an amenable number.

121212110209 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212110209 is an equidigital number, since it uses as much as digits as its factorization.

121212110209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 121212110209 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, two hundred nine".