13231212221 has 8 divisors (see below), whose sum is σ = 13414924800. Its totient is φ = 13047905520.

The previous prime is 13231212199. The next prime is 13231212227. The reversal of 13231212221 is 12221213231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13231212221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13231212193 and 13231212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231212227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35525 + ... + 166506.

It is an arithmetic number, because the mean of its divisors is an integer number (1676865600).

Almost surely, 2^13231212221 is an apocalyptic number.

It is an amenable number.

13231212221 is a deficient number, since it is larger than the sum of its proper divisors (183712579).

13231212221 is an equidigital number, since it uses as much as digits as its factorization.

13231212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202939.

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

Adding to 13231212221 its reverse (12221213231), we get a palindrome (25452425452).

The spelling of 13231212221 in words is "thirteen billion, two hundred thirty-one million, two hundred twelve thousand, two hundred twenty-one".