121313221013 has 2 divisors, whose sum is σ = 121313221014. Its totient is φ = 121313221012.

The previous prime is 121313220961. The next prime is 121313221019. The reversal of 121313221013 is 310122313121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65393741284 + 55919479729 = 255722^2 + 236473^2 .

It is a cyclic number.

It is not a de Polignac number, because 121313221013 - 2⁶ = 121313220949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121313221019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656610506 + 60656610507.

It is an arithmetic number, because the mean of its divisors is an integer number (60656610507).

Almost surely, 2^121313221013 is an apocalyptic number.

It is an amenable number.

121313221013 is a deficient number, since it is larger than the sum of its proper divisors (1).

121313221013 is an equidigital number, since it uses as much as digits as its factorization.

121313221013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 121313221013 its reverse (310122313121), we get a palindrome (431435534134).

The spelling of 121313221013 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred twenty-one thousand, thirteen".