12521432315 has 12 divisors (see below), whose sum is σ = 17478897696. Its totient is φ = 8586124848.

The previous prime is 12521432311. The next prime is 12521432321. The reversal of 12521432315 is 51323412521.

It is not a de Polignac number, because 12521432315 - 2² = 12521432311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521432311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25553699 + ... + 25554188.

It is an arithmetic number, because the mean of its divisors is an integer number (1456574808).

Almost surely, 2^12521432315 is an apocalyptic number.

12521432315 is a deficient number, since it is larger than the sum of its proper divisors (4957465381).

12521432315 is an equidigital number, since it uses as much as digits as its factorization.

12521432315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51107906 (or 51107899 counting only the distinct ones).

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

Adding to 12521432315 its reverse (51323412521), we get a palindrome (63844844836).

The spelling of 12521432315 in words is "twelve billion, five hundred twenty-one million, four hundred thirty-two thousand, three hundred fifteen".