1221434323313 has 2 divisors, whose sum is σ = 1221434323314. Its totient is φ = 1221434323312.

The previous prime is 1221434323261. The next prime is 1221434323349. The reversal of 1221434323313 is 3133234341221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1165432520704 + 56001802609 = 1079552^2 + 236647^2 .

It is an emirp because it is prime and its reverse (3133234341221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221434323313 - 2¹⁰ = 1221434322289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221434323313.

It is not a weakly prime, because it can be changed into another prime (1221434323363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610717161656 + 610717161657.

It is an arithmetic number, because the mean of its divisors is an integer number (610717161657).

Almost surely, 2^{1221434323313} is an apocalyptic number.

It is an amenable number.

1221434323313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221434323313 is an equidigital number, since it uses as much as digits as its factorization.

1221434323313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 32.

Adding to 1221434323313 its reverse (3133234341221), we get a palindrome (4354668664534).

The spelling of 1221434323313 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-four million, three hundred twenty-three thousand, three hundred thirteen".