1320203321 has 16 divisors (see below), whose sum is σ = 1379069328. Its totient is φ = 1262822400.

The previous prime is 1320203281. The next prime is 1320203359. The reversal of 1320203321 is 1233020231.

It can be written as a sum of positive squares in 8 ways, for example, as 128572921 + 1191630400 = 11339^2 + 34520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320203321 - 2²² = 1316009017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320203321.

It is not an unprimeable number, because it can be changed into a prime (1320203021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540515 + ... + 542951.

It is an arithmetic number, because the mean of its divisors is an integer number (86191833).

Almost surely, 2^1320203321 is an apocalyptic number.

It is an amenable number.

1320203321 is a deficient number, since it is larger than the sum of its proper divisors (58866007).

1320203321 is a wasteful number, since it uses less digits than its factorization.

1320203321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 1320203321 is about 36334.6022546002. The cubic root of 1320203321 is about 1097.0176296330.

Adding to 1320203321 its reverse (1233020231), we get a palindrome (2553223552).

The spelling of 1320203321 in words is "one billion, three hundred twenty million, two hundred three thousand, three hundred twenty-one".