13243254221 has 4 divisors (see below), whose sum is σ = 13285837344. Its totient is φ = 13200671100.

The previous prime is 13243254209. The next prime is 13243254247. The reversal of 13243254221 is 12245234231.

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 13243254221 - 2¹⁰ = 13243253197 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 (13243454221) 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, 21291095 + ... + 21291716.

It is an arithmetic number, because the mean of its divisors is an integer number (3321459336).

Almost surely, 2^13243254221 is an apocalyptic number.

It is an amenable number.

13243254221 is a deficient number, since it is larger than the sum of its proper divisors (42583123).

13243254221 is an equidigital number, since it uses as much as digits as its factorization.

13243254221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42583122.

The product of its digits is 11520, while the sum is 29.

Adding to 13243254221 its reverse (12245234231), we get a palindrome (25488488452).

The spelling of 13243254221 in words is "thirteen billion, two hundred forty-three million, two hundred fifty-four thousand, two hundred twenty-one".