12443415221 has 4 divisors (see below), whose sum is σ = 12844815744. Its totient is φ = 12042014700.

The previous prime is 12443415209. The next prime is 12443415227. The reversal of 12443415221 is 12251434421.

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 12443415221 - 2⁶ = 12443415157 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 (12443415227) 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, 200700215 + ... + 200700276.

It is an arithmetic number, because the mean of its divisors is an integer number (3211203936).

Almost surely, 2^12443415221 is an apocalyptic number.

It is an amenable number.

12443415221 is a deficient number, since it is larger than the sum of its proper divisors (401400523).

12443415221 is an equidigital number, since it uses as much as digits as its factorization.

12443415221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401400522.

The product of its digits is 7680, while the sum is 29.

Adding to 12443415221 its reverse (12251434421), we get a palindrome (24694849642).

The spelling of 12443415221 in words is "twelve billion, four hundred forty-three million, four hundred fifteen thousand, two hundred twenty-one".