13221200221 has 4 divisors (see below), whose sum is σ = 13256646172. Its totient is φ = 13185754272.

The previous prime is 13221200219. The next prime is 13221200281. The reversal of 13221200221 is 12200212231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8880235225 + 4340964996 = 94235^2 + 65886^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221200221 - 2¹ = 13221200219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13221200195 and 13221200204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221200281) 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, 17722416 + ... + 17723161.

It is an arithmetic number, because the mean of its divisors is an integer number (3314161543).

Almost surely, 2^13221200221 is an apocalyptic number.

It is an amenable number.

13221200221 is a deficient number, since it is larger than the sum of its proper divisors (35445951).

13221200221 is an equidigital number, since it uses as much as digits as its factorization.

13221200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35445950.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 13221200221 its reverse (12200212231), we get a palindrome (25421412452).

The spelling of 13221200221 in words is "thirteen billion, two hundred twenty-one million, two hundred thousand, two hundred twenty-one".