1311223321 has 2 divisors, whose sum is σ = 1311223322. Its totient is φ = 1311223320.

The previous prime is 1311223289. The next prime is 1311223349. The reversal of 1311223321 is 1233221131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1298521225 + 12702096 = 36035^2 + 3564^2 .

It is an emirp because it is prime and its reverse (1233221131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311223321 - 2⁵ = 1311223289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311223351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655611660 + 655611661.

It is an arithmetic number, because the mean of its divisors is an integer number (655611661).

Almost surely, 2^1311223321 is an apocalyptic number.

It is an amenable number.

1311223321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311223321 is an equidigital number, since it uses as much as digits as its factorization.

1311223321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 1311223321 is about 36210.8177344837. The cubic root of 1311223321 is about 1094.5246704337.

Adding to 1311223321 its reverse (1233221131), we get a palindrome (2544444452).

The spelling of 1311223321 in words is "one billion, three hundred eleven million, two hundred twenty-three thousand, three hundred twenty-one".