13255321521 has 32 divisors (see below), whose sum is σ = 20397646080. Its totient is φ = 7591567104.

The previous prime is 13255321511. The next prime is 13255321523. The reversal of 13255321521 is 12512355231.

It is not a de Polignac number, because 13255321521 - 2⁵ = 13255321489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13255321523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166506 + ... + 232883.

It is an arithmetic number, because the mean of its divisors is an integer number (637426440).

Almost surely, 2^13255321521 is an apocalyptic number.

It is an amenable number.

13255321521 is a deficient number, since it is larger than the sum of its proper divisors (7142324559).

13255321521 is a wasteful number, since it uses less digits than its factorization.

13255321521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399465.

The product of its digits is 9000, while the sum is 30.

Adding to 13255321521 its reverse (12512355231), we get a palindrome (25767676752).

The spelling of 13255321521 in words is "thirteen billion, two hundred fifty-five million, three hundred twenty-one thousand, five hundred twenty-one".