13031132221 has 4 divisors (see below), whose sum is σ = 13046303200. Its totient is φ = 13015961244.

The previous prime is 13031132209. The next prime is 13031132227. The reversal of 13031132221 is 12223113031.

13031132221 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, and also an emirpimes, since its reverse is a distinct semiprime: 12223113031 = 23 ⋅531439697.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13031132221 is a prime.

It is a super-2 number, since 2×13031132221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031132227) 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, 7584201 + ... + 7585918.

It is an arithmetic number, because the mean of its divisors is an integer number (3261575800).

Almost surely, 2^13031132221 is an apocalyptic number.

It is an amenable number.

13031132221 is a deficient number, since it is larger than the sum of its proper divisors (15170979).

13031132221 is an equidigital number, since it uses as much as digits as its factorization.

13031132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15170978.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13031132221 its reverse (12223113031), we get a palindrome (25254245252).

The spelling of 13031132221 in words is "thirteen billion, thirty-one million, one hundred thirty-two thousand, two hundred twenty-one".