13220313121 has 4 divisors (see below), whose sum is σ = 13244048532. Its totient is φ = 13196577712.

The previous prime is 13220313059. The next prime is 13220313179. The reversal of 13220313121 is 12131302231.

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 7597562896 + 5622750225 = 87164^2 + 74985^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220313121 - 2²³ = 13211924513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13220313181) 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, 11866870 + ... + 11867983.

It is an arithmetic number, because the mean of its divisors is an integer number (3311012133).

Almost surely, 2^13220313121 is an apocalyptic number.

It is an amenable number.

13220313121 is a deficient number, since it is larger than the sum of its proper divisors (23735411).

13220313121 is an equidigital number, since it uses as much as digits as its factorization.

13220313121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23735410.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13220313121 its reverse (12131302231), we get a palindrome (25351615352).

The spelling of 13220313121 in words is "thirteen billion, two hundred twenty million, three hundred thirteen thousand, one hundred twenty-one".