13323201221 has 12 divisors (see below), whose sum is σ = 14651798700. Its totient is φ = 12105973440.

The previous prime is 13323201167. The next prime is 13323201247. The reversal of 13323201221 is 12210232331.

It can be written as a sum of positive squares in 2 ways, for example, as 5677622500 + 7645578721 = 75350^2 + 87439^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13323201221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13323201193 and 13323201202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13323201821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226415 + ... + 279123.

It is an arithmetic number, because the mean of its divisors is an integer number (1220983225).

Almost surely, 2^13323201221 is an apocalyptic number.

13323201221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13323201221 is a deficient number, since it is larger than the sum of its proper divisors (1328597479).

13323201221 is a wasteful number, since it uses less digits than its factorization.

13323201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54820 (or 54809 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 13323201221 its reverse (12210232331), we get a palindrome (25533433552).

The spelling of 13323201221 in words is "thirteen billion, three hundred twenty-three million, two hundred one thousand, two hundred twenty-one".