13213313333221 has 4 divisors (see below), whose sum is σ = 13668944827500. Its totient is φ = 12757681838944.

The previous prime is 13213313333197. The next prime is 13213313333249. The reversal of 13213313333221 is 12233331331231.

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 8300817880996 + 4912495452225 = 2881114^2 + 2216415^2 .

It is a cyclic number.

It is not a de Polignac number, because 13213313333221 - 2¹³ = 13213313325029 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 (13213313333251) 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, 227815747096 + ... + 227815747153.

It is an arithmetic number, because the mean of its divisors is an integer number (3417236206875).

Almost surely, 2^{13213313333221} is an apocalyptic number.

It is an amenable number.

13213313333221 is a deficient number, since it is larger than the sum of its proper divisors (455631494279).

13213313333221 is an equidigital number, since it uses as much as digits as its factorization.

13213313333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455631494278.

The product of its digits is 17496, while the sum is 31.

Adding to 13213313333221 its reverse (12233331331231), we get a palindrome (25446644664452).

The spelling of 13213313333221 in words is "thirteen trillion, two hundred thirteen billion, three hundred thirteen million, three hundred thirty-three thousand, two hundred twenty-one".