13123202221 has 4 divisors (see below), whose sum is σ = 13155288700. Its totient is φ = 13091115744.

The previous prime is 13123202219. The next prime is 13123202249. The reversal of 13123202221 is 12220232131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12220232131 = 89 ⋅137305979.

It can be written as a sum of positive squares in 2 ways, for example, as 5486364900 + 7636837321 = 74070^2 + 87389^2 .

It is a cyclic number.

It is not a de Polignac number, because 13123202221 - 2¹ = 13123202219 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 (13123202201) 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, 16042626 + ... + 16043443.

It is an arithmetic number, because the mean of its divisors is an integer number (3288822175).

Almost surely, 2^13123202221 is an apocalyptic number.

It is an amenable number.

13123202221 is a deficient number, since it is larger than the sum of its proper divisors (32086479).

13123202221 is an equidigital number, since it uses as much as digits as its factorization.

13123202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32086478.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 13123202221 its reverse (12220232131), we get a palindrome (25343434352).

The spelling of 13123202221 in words is "thirteen billion, one hundred twenty-three million, two hundred two thousand, two hundred twenty-one".