12424240021 has 4 divisors (see below), whose sum is σ = 12438311392. Its totient is φ = 12410168652.

The previous prime is 12424240013. The next prime is 12424240043. The reversal of 12424240021 is 12004242421.

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 12424240021 - 2³ = 12424240013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12424239974 and 12424240001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12424240321) 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, 7034361 + ... + 7036126.

It is an arithmetic number, because the mean of its divisors is an integer number (3109577848).

Almost surely, 2^12424240021 is an apocalyptic number.

It is an amenable number.

12424240021 is a deficient number, since it is larger than the sum of its proper divisors (14071371).

12424240021 is an equidigital number, since it uses as much as digits as its factorization.

12424240021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14071370.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 12424240021 its reverse (12004242421), we get a palindrome (24428482442).

It can be divided in two parts, 124242400 and 21, that added together give a palindrome (124242421).

The spelling of 12424240021 in words is "twelve billion, four hundred twenty-four million, two hundred forty thousand, twenty-one".