13121021320 has 64 divisors (see below), whose sum is σ = 32813864640. Its totient is φ = 4681248000.

The previous prime is 13121021297. The next prime is 13121021471. The reversal of 13121021320 is 2312012131.

It is a super-2 number, since 2×13121021320² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13121021294 and 13121021303.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258006 + ... + 304645.

It is an arithmetic number, because the mean of its divisors is an integer number (512716635).

Almost surely, 2^13121021320 is an apocalyptic number.

13121021320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121021320 is an abundant number, since it is smaller than the sum of its proper divisors (19692843320).

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

13121021320 is a wasteful number, since it uses less digits than its factorization.

13121021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562726 (or 562722 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 13121021320 its reverse (2312012131), we get a palindrome (15433033451).

The spelling of 13121021320 in words is "thirteen billion, one hundred twenty-one million, twenty-one thousand, three hundred twenty".