13231223221 has 4 divisors (see below), whose sum is σ = 13352610700. Its totient is φ = 13109835744.

The previous prime is 13231223197. The next prime is 13231223293. The reversal of 13231223221 is 12232213231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12232213231 = 7 ⋅1747459033.

It can be written as a sum of positive squares in 2 ways, for example, as 6456122500 + 6775100721 = 80350^2 + 82311^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231223221 - 2¹¹ = 13231221173 is a prime.

It is a super-2 number, since 2×13231223221² (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 = 13231223192 and 13231223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231221221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60693576 + ... + 60693793.

It is an arithmetic number, because the mean of its divisors is an integer number (3338152675).

Almost surely, 2^13231223221 is an apocalyptic number.

It is an amenable number.

13231223221 is a deficient number, since it is larger than the sum of its proper divisors (121387479).

13231223221 is a wasteful number, since it uses less digits than its factorization.

13231223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121387478.

The product of its digits is 864, while the sum is 22.

Adding to 13231223221 its reverse (12232213231), we get a palindrome (25463436452).

The spelling of 13231223221 in words is "thirteen billion, two hundred thirty-one million, two hundred twenty-three thousand, two hundred twenty-one".