12513756321 has 48 divisors (see below), whose sum is σ = 20915107200. Its totient is φ = 7125480960.

The previous prime is 12513756313. The next prime is 12513756323. The reversal of 12513756321 is 12365731521.

12513756321 is a `hidden beast` number, since 1 + 2 + 5 + 13 + 7 + 5 + 632 + 1 = 666.

It is not a de Polignac number, because 12513756321 - 2³ = 12513756313 is a prime.

It is a super-2 number, since 2×12513756321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12513756323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1001911 + ... + 1014323.

It is an arithmetic number, because the mean of its divisors is an integer number (435731400).

Almost surely, 2^12513756321 is an apocalyptic number.

12513756321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12513756321 is a deficient number, since it is larger than the sum of its proper divisors (8401350879).

12513756321 is a wasteful number, since it uses less digits than its factorization.

12513756321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13046 (or 13043 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The spelling of 12513756321 in words is "twelve billion, five hundred thirteen million, seven hundred fifty-six thousand, three hundred twenty-one".