13220311221 has 24 divisors (see below), whose sum is σ = 20631971360. Its totient is φ = 8109053856.

The previous prime is 13220311213. The next prime is 13220311259. The reversal of 13220311221 is 12211302231.

13220311221 is a `hidden beast` number, since 132 + 2 + 0 + 311 + 221 = 666.

It is not a de Polignac number, because 13220311221 - 2³ = 13220311213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13220311194 and 13220311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220311201) 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, 148111 + ... + 219948.

Almost surely, 2^13220311221 is an apocalyptic number.

It is an amenable number.

13220311221 is a deficient number, since it is larger than the sum of its proper divisors (7411660139).

13220311221 is a wasteful number, since it uses less digits than its factorization.

13220311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368385 (or 368382 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 13220311221 its reverse (12211302231), we get a palindrome (25431613452).

The spelling of 13220311221 in words is "thirteen billion, two hundred twenty million, three hundred eleven thousand, two hundred twenty-one".