1320311321 has 12 divisors (see below), whose sum is σ = 1537960320. Its totient is φ = 1130157000.

The previous prime is 1320311287. The next prime is 1320311383. The reversal of 1320311321 is 1231130231.

It is not a de Polignac number, because 1320311321 - 2¹⁸ = 1320049177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320311321.

It is not an unprimeable number, because it can be changed into a prime (1320311221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18860 + ... + 54738.

It is an arithmetic number, because the mean of its divisors is an integer number (128163360).

Almost surely, 2^1320311321 is an apocalyptic number.

It is an amenable number.

1320311321 is a deficient number, since it is larger than the sum of its proper divisors (217648999).

1320311321 is an equidigital number, since it uses as much as digits as its factorization.

1320311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36644 (or 36637 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1320311321 is about 36336.0884108348. The cubic root of 1320311321 is about 1097.0475428723.

Adding to 1320311321 its reverse (1231130231), we get a palindrome (2551441552).

The spelling of 1320311321 in words is "one billion, three hundred twenty million, three hundred eleven thousand, three hundred twenty-one".