12404413221 has 4 divisors (see below), whose sum is σ = 16539217632. Its totient is φ = 8269608812.

The previous prime is 12404413159. The next prime is 12404413243. The reversal of 12404413221 is 12231440421.

12404413221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12231440421 = 3 ⋅4077146807.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12404413221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12404413191 and 12404413200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12404413271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067402201 + ... + 2067402206.

It is an arithmetic number, because the mean of its divisors is an integer number (4134804408).

Almost surely, 2^12404413221 is an apocalyptic number.

It is an amenable number.

12404413221 is a deficient number, since it is larger than the sum of its proper divisors (4134804411).

12404413221 is an equidigital number, since it uses as much as digits as its factorization.

12404413221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134804410.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 12404413221 its reverse (12231440421), we get a palindrome (24635853642).

The spelling of 12404413221 in words is "twelve billion, four hundred four million, four hundred thirteen thousand, two hundred twenty-one".