12421344433 has 4 divisors (see below), whose sum is σ = 12476064240. Its totient is φ = 12366624628.

The previous prime is 12421344391. The next prime is 12421344437. The reversal of 12421344433 is 33444312421.

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: 33444312421 = 13 ⋅2572639417.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12421344433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12421344395 and 12421344404.

It is not an unprimeable number, because it can be changed into a prime (12421344437) 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, 27359563 + ... + 27360016.

It is an arithmetic number, because the mean of its divisors is an integer number (3119016060).

Almost surely, 2^12421344433 is an apocalyptic number.

It is an amenable number.

12421344433 is a deficient number, since it is larger than the sum of its proper divisors (54719807).

12421344433 is an equidigital number, since it uses as much as digits as its factorization.

12421344433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54719806.

The product of its digits is 27648, while the sum is 31.

Adding to 12421344433 its reverse (33444312421), we get a palindrome (45865656854).

The spelling of 12421344433 in words is "twelve billion, four hundred twenty-one million, three hundred forty-four thousand, four hundred thirty-three".