12354231521 has 4 divisors (see below), whose sum is σ = 12378990000. Its totient is φ = 12329473044.

The previous prime is 12354231493. The next prime is 12354231557. The reversal of 12354231521 is 12513245321.

12354231521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12354231521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12354251521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12378491 + ... + 12379488.

It is an arithmetic number, because the mean of its divisors is an integer number (3094747500).

Almost surely, 2^12354231521 is an apocalyptic number.

It is an amenable number.

12354231521 is a deficient number, since it is larger than the sum of its proper divisors (24758479).

12354231521 is an equidigital number, since it uses as much as digits as its factorization.

12354231521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24758478.

The product of its digits is 7200, while the sum is 29.

Adding to 12354231521 its reverse (12513245321), we get a palindrome (24867476842).

The spelling of 12354231521 in words is "twelve billion, three hundred fifty-four million, two hundred thirty-one thousand, five hundred twenty-one".