1321333760 has 88 divisors (see below), whose sum is σ = 3182364456. Its totient is φ = 526417920.

The previous prime is 1321333753. The next prime is 1321333771. The reversal of 1321333760 is 673331231.

It can be written as a sum of positive squares in 4 ways, for example, as 200958976 + 1120374784 = 14176^2 + 33472^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2155214 + ... + 2155826.

Almost surely, 2^1321333760 is an apocalyptic number.

1321333760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321333760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591182228).

1321333760 is an abundant number, since it is smaller than the sum of its proper divisors (1861030696).

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

1321333760 is an equidigital number, since it uses as much as digits as its factorization.

1321333760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1041 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 29.

The square root of 1321333760 is about 36350.1548827512. The cubic root of 1321333760 is about 1097.3306515511.

Adding to 1321333760 its reverse (673331231), we get a palindrome (1994664991).

The spelling of 1321333760 in words is "one billion, three hundred twenty-one million, three hundred thirty-three thousand, seven hundred sixty".