13305143221 has 4 divisors (see below), whose sum is σ = 13347925344. Its totient is φ = 13262361100.

The previous prime is 13305143219. The next prime is 13305143233. The reversal of 13305143221 is 12234150331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13305143221 - 2¹ = 13305143219 is a prime.

It is a super-2 number, since 2×13305143221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13305143251) 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, 21390595 + ... + 21391216.

It is an arithmetic number, because the mean of its divisors is an integer number (3336981336).

Almost surely, 2^13305143221 is an apocalyptic number.

It is an amenable number.

13305143221 is a deficient number, since it is larger than the sum of its proper divisors (42782123).

13305143221 is an equidigital number, since it uses as much as digits as its factorization.

13305143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42782122.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 13305143221 its reverse (12234150331), we get a palindrome (25539293552).

The spelling of 13305143221 in words is "thirteen billion, three hundred five million, one hundred forty-three thousand, two hundred twenty-one".