1311244001320 has 128 divisors (see below), whose sum is σ = 3250151308800. Its totient is φ = 472133836800.

The previous prime is 1311244001317. The next prime is 1311244001359. The reversal of 1311244001320 is 231004421131.

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 = 1311244001291 and 1311244001300.

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, 81380065 + ... + 81396175.

It is an arithmetic number, because the mean of its divisors is an integer number (25391807100).

Almost surely, 2^{1311244001320} is an apocalyptic number.

1311244001320 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 1311244001320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1625075654400).

1311244001320 is an abundant number, since it is smaller than the sum of its proper divisors (1938907307480).

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

1311244001320 is a wasteful number, since it uses less digits than its factorization.

1311244001320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17939 (or 17935 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1311244001320 its reverse (231004421131), we get a palindrome (1542248422451).

The spelling of 1311244001320 in words is "one trillion, three hundred eleven billion, two hundred forty-four million, one thousand, three hundred twenty".