1321311232 has 44 divisors (see below), whose sum is σ = 2646279720. Its totient is φ = 659419136.

The previous prime is 1321311227. The next prime is 1321311239. The reversal of 1321311232 is 2321131231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321311239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815319 + ... + 816937.

Almost surely, 2^1321311232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321311232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1323139860).

1321311232 is an abundant number, since it is smaller than the sum of its proper divisors (1324968488).

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

1321311232 is an equidigital number, since it uses as much as digits as its factorization.

1321311232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436 (or 2418 counting only the distinct ones).

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

The square root of 1321311232 is about 36349.8450065471. The cubic root of 1321311232 is about 1097.3244152248.

Adding to 1321311232 its reverse (2321131231), we get a palindrome (3642442463).

The spelling of 1321311232 in words is "one billion, three hundred twenty-one million, three hundred eleven thousand, two hundred thirty-two".