13231222121 has 16 divisors (see below), whose sum is σ = 14873241600. Its totient is φ = 11678715840.

The previous prime is 13231222063. The next prime is 13231222133. The reversal of 13231222121 is 12122213231.

It is a cyclic number.

It is not a de Polignac number, because 13231222121 - 2¹⁰ = 13231221097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13231222093 and 13231222102.

It is not an unprimeable number, because it can be changed into a prime (13231222171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1430291 + ... + 1439511.

It is an arithmetic number, because the mean of its divisors is an integer number (929577600).

Almost surely, 2^13231222121 is an apocalyptic number.

It is an amenable number.

13231222121 is a deficient number, since it is larger than the sum of its proper divisors (1642019479).

13231222121 is a wasteful number, since it uses less digits than its factorization.

13231222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14056.

The product of its digits is 288, while the sum is 20.

Adding to 13231222121 its reverse (12122213231), we get a palindrome (25353435352).

The spelling of 13231222121 in words is "thirteen billion, two hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty-one".