12520443231 has 24 divisors (see below), whose sum is σ = 18877743456. Its totient is φ = 7981364160.

The previous prime is 12520443211. The next prime is 12520443239. The reversal of 12520443231 is 13234402521.

12520443231 is a `hidden beast` number, since 1 + 25 + 204 + 432 + 3 + 1 = 666.

It is not a de Polignac number, because 12520443231 - 2²¹ = 12518346079 is a prime.

It is a super-2 number, since 2×12520443231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12520443195 and 12520443204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520443239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 739521 + ... + 756261.

It is an arithmetic number, because the mean of its divisors is an integer number (786572644).

Almost surely, 2^12520443231 is an apocalyptic number.

12520443231 is a deficient number, since it is larger than the sum of its proper divisors (6357300225).

12520443231 is a wasteful number, since it uses less digits than its factorization.

12520443231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20383 (or 20380 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 12520443231 its reverse (13234402521), we get a palindrome (25754845752).

The spelling of 12520443231 in words is "twelve billion, five hundred twenty million, four hundred forty-three thousand, two hundred thirty-one".