13313203211221 has 6 divisors (see below), whose sum is σ = 13917204869750. Its totient is φ = 12734368288488.

The previous prime is 13313203211183. The next prime is 13313203211249. The reversal of 13313203211221 is 12211230231331.

It can be written as a sum of positive squares in only one way, i.e., 12699879288721 + 613323922500 = 3563689^2 + 783150^2 .

It is not a de Polignac number, because 13313203211221 - 2²⁷ = 13313068993493 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 (13313203211521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12583367346 + ... + 12583368403.

Almost surely, 2^{13313203211221} is an apocalyptic number.

It is an amenable number.

13313203211221 is a deficient number, since it is larger than the sum of its proper divisors (604001658529).

13313203211221 is an equidigital number, since it uses as much as digits as its factorization.

13313203211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25166735795 (or 25166735772 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 13313203211221 its reverse (12211230231331), we get a palindrome (25524433442552).

The spelling of 13313203211221 in words is "thirteen trillion, three hundred thirteen billion, two hundred three million, two hundred eleven thousand, two hundred twenty-one".