13231231321 has 24 divisors (see below), whose sum is σ = 17520698304. Its totient is φ = 9861778080.

The previous prime is 13231231301. The next prime is 13231231327. The reversal of 13231231321 is 12313213231.

It is not a de Polignac number, because 13231231321 - 2¹⁷ = 13231100249 is a prime.

It is a super-2 number, since 2×13231231321² (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 = 13231231292 and 13231231301.

It is not an unprimeable number, because it can be changed into a prime (13231231327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 521250 + ... + 546043.

It is an arithmetic number, because the mean of its divisors is an integer number (730029096).

Almost surely, 2^13231231321 is an apocalyptic number.

13231231321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13231231321 is a deficient number, since it is larger than the sum of its proper divisors (4289466983).

13231231321 is a wasteful number, since it uses less digits than its factorization.

13231231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067341 (or 1067334 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

Adding to 13231231321 its reverse (12313213231), we get a palindrome (25544444552).

The spelling of 13231231321 in words is "thirteen billion, two hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty-one".