13031123321 has 4 divisors (see below), whose sum is σ = 13308381312. Its totient is φ = 12753865332.

The previous prime is 13031123263. The next prime is 13031123359. The reversal of 13031123321 is 12332113031.

13031123321 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: 12332113031 = 7 ⋅1761730433.

It is a cyclic number.

It is not a de Polignac number, because 13031123321 - 2⁶ = 13031123257 is a prime.

It is a super-2 number, since 2×13031123321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13031123293 and 13031123302.

It is not an unprimeable number, because it can be changed into a prime (13031123221) 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, 138628925 + ... + 138629018.

It is an arithmetic number, because the mean of its divisors is an integer number (3327095328).

Almost surely, 2^13031123321 is an apocalyptic number.

It is an amenable number.

13031123321 is a deficient number, since it is larger than the sum of its proper divisors (277257991).

13031123321 is an equidigital number, since it uses as much as digits as its factorization.

13031123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277257990.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 13031123321 its reverse (12332113031), we get a palindrome (25363236352).

The spelling of 13031123321 in words is "thirteen billion, thirty-one million, one hundred twenty-three thousand, three hundred twenty-one".