121313310203209 has 4 divisors (see below), whose sum is σ = 128449387274004. Its totient is φ = 114177233132416.

The previous prime is 121313310203207. The next prime is 121313310203249. The reversal of 121313310203209 is 902302013313121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45591934752400 + 75721375450809 = 6752180^2 + 8701803^2 .

It is a cyclic number.

It is not a de Polignac number, because 121313310203209 - 2¹ = 121313310203207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121313310203201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3568038535372 + ... + 3568038535405.

It is an arithmetic number, because the mean of its divisors is an integer number (32112346818501).

Almost surely, 2^{121313310203209} is an apocalyptic number.

It is an amenable number.

121313310203209 is a deficient number, since it is larger than the sum of its proper divisors (7136077070795).

121313310203209 is an equidigital number, since it uses as much as digits as its factorization.

121313310203209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136077070794.

The product of its (nonzero) digits is 5832, while the sum is 31.

The spelling of 121313310203209 in words is "one hundred twenty-one trillion, three hundred thirteen billion, three hundred ten million, two hundred three thousand, two hundred nine".