12543444434521 has 128 divisors (see below), whose sum is σ = 17950218854400. Its totient is φ = 8621430048000.

The previous prime is 12543444434413. The next prime is 12543444434539.

12543444434521 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12543444434521 - 2¹⁵ = 12543444401753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12543444434581) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1266881671 + ... + 1266891571.

It is an arithmetic number, because the mean of its divisors is an integer number (140236084800).

Almost surely, 2^{12543444434521} is an apocalyptic number.

12543444434521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12543444434521 is a deficient number, since it is larger than the sum of its proper divisors (5406774419879).

12543444434521 is a wasteful number, since it uses less digits than its factorization.

12543444434521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11092 (or 11078 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 46.

It can be divided in two parts, 1254344 and 4434521, that added together give a palindrome (5688865).

The spelling of 12543444434521 in words is "twelve trillion, five hundred forty-three billion, four hundred forty-four million, four hundred thirty-four thousand, five hundred twenty-one".