13121203331320 has 128 divisors (see below), whose sum is σ = 34066442160000. Its totient is φ = 4455268909056.

The previous prime is 13121203331293. The next prime is 13121203331359. The reversal of 13121203331320 is 2313330212131.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38971056 + ... + 39306304.

It is an arithmetic number, because the mean of its divisors is an integer number (266144079375).

Almost surely, 2^{13121203331320} is an apocalyptic number.

13121203331320 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 13121203331320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17033221080000).

13121203331320 is an abundant number, since it is smaller than the sum of its proper divisors (20945238828680).

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

13121203331320 is a wasteful number, since it uses less digits than its factorization.

13121203331320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336617 (or 336613 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 13121203331320 its reverse (2313330212131), we get a palindrome (15434533543451).

The spelling of 13121203331320 in words is "thirteen trillion, one hundred twenty-one billion, two hundred three million, three hundred thirty-one thousand, three hundred twenty".