13203231221 has 4 divisors (see below), whose sum is σ = 13207270944. Its totient is φ = 13199191500.

The previous prime is 13203231179. The next prime is 13203231241. The reversal of 13203231221 is 12213230231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13203231221 - 2¹⁰ = 13203230197 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 = 13203231193 and 13203231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13203231241) 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 3 ways as a sum of consecutive naturals, for example, 2014955 + ... + 2021496.

It is an arithmetic number, because the mean of its divisors is an integer number (3301817736).

Almost surely, 2^13203231221 is an apocalyptic number.

It is an amenable number.

13203231221 is a deficient number, since it is larger than the sum of its proper divisors (4039723).

13203231221 is an equidigital number, since it uses as much as digits as its factorization.

13203231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039722.

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

Adding to 13203231221 its reverse (12213230231), we get a palindrome (25416461452).

The spelling of 13203231221 in words is "thirteen billion, two hundred three million, two hundred thirty-one thousand, two hundred twenty-one".