13021221002221 has 8 divisors (see below), whose sum is σ = 13025473379064. Its totient is φ = 13016968888320.

The previous prime is 13021221002201. The next prime is 13021221002227. The reversal of 13021221002221 is 12220012212031.

It can be written as a sum of positive squares in 4 ways, for example, as 5531480648100 + 7489740354121 = 2351910^2 + 2736739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13021221002221 - 2²⁵ = 13021187447789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13021221002227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160920045 + ... + 161000941.

It is an arithmetic number, because the mean of its divisors is an integer number (1628184172383).

Almost surely, 2^{13021221002221} is an apocalyptic number.

It is an amenable number.

13021221002221 is a deficient number, since it is larger than the sum of its proper divisors (4252376843).

13021221002221 is an equidigital number, since it uses as much as digits as its factorization.

13021221002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131471.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 13021221002221 its reverse (12220012212031), we get a palindrome (25241233214252).

The spelling of 13021221002221 in words is "thirteen trillion, twenty-one billion, two hundred twenty-one million, two thousand, two hundred twenty-one".