13243003221 has 32 divisors (see below), whose sum is σ = 20512846080. Its totient is φ = 7443431424.

The previous prime is 13243003201. The next prime is 13243003231. The reversal of 13243003221 is 12230034231.

It is not a de Polignac number, because 13243003221 - 2⁷ = 13243003093 is a prime.

It is a super-2 number, since 2×13243003221² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13243003201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342361 + ... + 379073.

It is an arithmetic number, because the mean of its divisors is an integer number (641026440).

Almost surely, 2^13243003221 is an apocalyptic number.

It is an amenable number.

13243003221 is a deficient number, since it is larger than the sum of its proper divisors (7269842859).

13243003221 is a wasteful number, since it uses less digits than its factorization.

13243003221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37005.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 13243003221 its reverse (12230034231), we get a palindrome (25473037452).

The spelling of 13243003221 in words is "thirteen billion, two hundred forty-three million, three thousand, two hundred twenty-one".