13221325557 has 24 divisors (see below), whose sum is σ = 21084624288. Its totient is φ = 7916378400.

The previous prime is 13221325547. The next prime is 13221325573. The reversal of 13221325557 is 75552312231.

13221325557 is a `hidden beast` number, since 1 + 322 + 1 + 325 + 5 + 5 + 7 = 666.

13221325557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13221325557 - 2¹⁰ = 13221324533 is a prime.

It is a super-3 number, since 3×13221325557³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221325547) 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 23 ways as a sum of consecutive naturals, for example, 796294 + ... + 812727.

It is an arithmetic number, because the mean of its divisors is an integer number (878526012).

Almost surely, 2^13221325557 is an apocalyptic number.

It is an amenable number.

13221325557 is a deficient number, since it is larger than the sum of its proper divisors (7863298731).

13221325557 is a wasteful number, since it uses less digits than its factorization.

13221325557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609121 (or 1609118 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

Adding to 13221325557 its reverse (75552312231), we get a palindrome (88773637788).

The spelling of 13221325557 in words is "thirteen billion, two hundred twenty-one million, three hundred twenty-five thousand, five hundred fifty-seven".