1311321130320 has 160 divisors (see below), whose sum is σ = 4160945289600. Its totient is φ = 341445629952.

The previous prime is 1311321130291. The next prime is 1311321130367. The reversal of 1311321130320 is 230311231131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35781766 + ... + 35818394.

It is an arithmetic number, because the mean of its divisors is an integer number (26005908060).

Almost surely, 2^{1311321130320} is an apocalyptic number.

1311321130320 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 1311321130320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2080472644800).

1311321130320 is an abundant number, since it is smaller than the sum of its proper divisors (2849624159280).

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

1311321130320 is a wasteful number, since it uses less digits than its factorization.

1311321130320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40157 (or 40151 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1311321130320 its reverse (230311231131), we get a palindrome (1541632361451).

The spelling of 1311321130320 in words is "one trillion, three hundred eleven billion, three hundred twenty-one million, one hundred thirty thousand, three hundred twenty".