13221210221 has 4 divisors (see below), whose sum is σ = 13796045472. Its totient is φ = 12646374972.

The previous prime is 13221210217. The next prime is 13221210227. The reversal of 13221210221 is 12201212231.

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 13221210221 - 2² = 13221210217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221210227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287417591 + ... + 287417636.

It is an arithmetic number, because the mean of its divisors is an integer number (3449011368).

Almost surely, 2^13221210221 is an apocalyptic number.

It is an amenable number.

13221210221 is a deficient number, since it is larger than the sum of its proper divisors (574835251).

13221210221 is an equidigital number, since it uses as much as digits as its factorization.

13221210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574835250.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 13221210221 its reverse (12201212231), we get a palindrome (25422422452).

The spelling of 13221210221 in words is "thirteen billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".