1321343320 has 32 divisors (see below), whose sum is σ = 3243298320. Its totient is φ = 480488320.

The previous prime is 1321343311. The next prime is 1321343323. The reversal of 1321343320 is 233431231.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1321343291 and 1321343300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321343323) 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 7 ways as a sum of consecutive naturals, for example, 1501087 + ... + 1501966.

Almost surely, 2^1321343320 is an apocalyptic number.

1321343320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321343320 is an abundant number, since it is smaller than the sum of its proper divisors (1921955000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321343320 is a wasteful number, since it uses less digits than its factorization.

1321343320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003075 (or 3003071 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 1321343320 is about 36350.2863812653. The cubic root of 1321343320 is about 1097.3332979821. Note that the first 3 decimals are identical.

Adding to 1321343320 its reverse (233431231), we get a palindrome (1554774551).

The spelling of 1321343320 in words is "one billion, three hundred twenty-one million, three hundred forty-three thousand, three hundred twenty".