1320322321 has 4 divisors (see below), whose sum is σ = 1321772544. Its totient is φ = 1318872100.

The previous prime is 1320322253. The next prime is 1320322343. The reversal of 1320322321 is 1232230231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320322321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320322361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 723745 + ... + 725566.

It is an arithmetic number, because the mean of its divisors is an integer number (330443136).

Almost surely, 2^1320322321 is an apocalyptic number.

It is an amenable number.

1320322321 is a deficient number, since it is larger than the sum of its proper divisors (1450223).

1320322321 is an equidigital number, since it uses as much as digits as its factorization.

1320322321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450222.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1320322321 is about 36336.2397751886. The cubic root of 1320322321 is about 1097.0505894996.

Adding to 1320322321 its reverse (1232230231), we get a palindrome (2552552552).

The spelling of 1320322321 in words is "one billion, three hundred twenty million, three hundred twenty-two thousand, three hundred twenty-one".