121313221243 has 2 divisors, whose sum is σ = 121313221244. Its totient is φ = 121313221242.

The previous prime is 121313221213. The next prime is 121313221301. The reversal of 121313221243 is 342122313121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121313221243 - 2¹³ = 121313213051 is a prime.

It is not a weakly prime, because it can be changed into another prime (121313221213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656610621 + 60656610622.

It is an arithmetic number, because the mean of its divisors is an integer number (60656610622).

Almost surely, 2^121313221243 is an apocalyptic number.

121313221243 is a deficient number, since it is larger than the sum of its proper divisors (1).

121313221243 is an equidigital number, since it uses as much as digits as its factorization.

121313221243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

Adding to 121313221243 its reverse (342122313121), we get a palindrome (463435534364).

The spelling of 121313221243 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred twenty-one thousand, two hundred forty-three".