13321112221 has 4 divisors (see below), whose sum is σ = 13327491100. Its totient is φ = 13314733344.

The previous prime is 13321112219. The next prime is 13321112267. The reversal of 13321112221 is 12221112331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12221112331 = 9677 ⋅1262903.

It can be written as a sum of positive squares in 2 ways, for example, as 10002200121 + 3318912100 = 100011^2 + 57610^2 .

It is a cyclic number.

It is not a de Polignac number, because 13321112221 - 2¹ = 13321112219 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 (13321112281) 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, 3186306 + ... + 3190483.

It is an arithmetic number, because the mean of its divisors is an integer number (3331872775).

Almost surely, 2^13321112221 is an apocalyptic number.

It is an amenable number.

13321112221 is a deficient number, since it is larger than the sum of its proper divisors (6378879).

13321112221 is an equidigital number, since it uses as much as digits as its factorization.

13321112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6378878.

The product of its digits is 144, while the sum is 19.

Adding to 13321112221 its reverse (12221112331), we get a palindrome (25542224552).

The spelling of 13321112221 in words is "thirteen billion, three hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".