121313221213 has 2 divisors, whose sum is σ = 121313221214. Its totient is φ = 121313221212.

The previous prime is 121313221187. The next prime is 121313221243. The reversal of 121313221213 is 312122313121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89701448004 + 31611773209 = 299502^2 + 177797^2 .

It is an emirp because it is prime and its reverse (312122313121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121313221213 - 2⁵ = 121313221181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121313221243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656610606 + 60656610607.

It is an arithmetic number, because the mean of its divisors is an integer number (60656610607).

Almost surely, 2^121313221213 is an apocalyptic number.

It is an amenable number.

121313221213 is a deficient number, since it is larger than the sum of its proper divisors (1).

121313221213 is an equidigital number, since it uses as much as digits as its factorization.

121313221213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

Adding to 121313221213 its reverse (312122313121), we get a palindrome (433435534334).

The spelling of 121313221213 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred twenty-one thousand, two hundred thirteen".