13202121221 has 4 divisors (see below), whose sum is σ = 13202414700. Its totient is φ = 13201827744.

The previous prime is 13202121217. The next prime is 13202121223. The reversal of 13202121221 is 12212120231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12212120231 = 41 ⋅297856591.

It can be written as a sum of positive squares in 2 ways, for example, as 600936196 + 12601185025 = 24514^2 + 112255^2 .

It is a cyclic number.

It is not a de Polignac number, because 13202121221 - 2² = 13202121217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13202121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13202121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63536 + ... + 174473.

It is an arithmetic number, because the mean of its divisors is an integer number (3300603675).

Almost surely, 2^13202121221 is an apocalyptic number.

It is an amenable number.

13202121221 is a deficient number, since it is larger than the sum of its proper divisors (293479).

13202121221 is an equidigital number, since it uses as much as digits as its factorization.

13202121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293478.

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

Adding to 13202121221 its reverse (12212120231), we get a palindrome (25414241452).

The spelling of 13202121221 in words is "thirteen billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".