1321320013120 has 28 divisors (see below), whose sum is σ = 3146393282004. Its totient is φ = 528528005120.

The previous prime is 1321320013103. The next prime is 1321320013151. The reversal of 1321320013120 is 213100231231.

It can be written as a sum of positive squares in 2 ways, for example, as 775400002624 + 545920010496 = 880568^2 + 738864^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2064562201 + ... + 2064562840.

It is an arithmetic number, because the mean of its divisors is an integer number (112371188643).

Almost surely, 2^{1321320013120} is an apocalyptic number.

1321320013120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321320013120 is an abundant number, since it is smaller than the sum of its proper divisors (1825073268884).

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

1321320013120 is an equidigital number, since it uses as much as digits as its factorization.

1321320013120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129125058 (or 4129125048 counting only the distinct ones).

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

Adding to 1321320013120 its reverse (213100231231), we get a palindrome (1534420244351).

The spelling of 1321320013120 in words is "one trillion, three hundred twenty-one billion, three hundred twenty million, thirteen thousand, one hundred twenty".