12344040021 has 4 divisors (see below), whose sum is σ = 16458720032. Its totient is φ = 8229360012.

The previous prime is 12344040019. The next prime is 12344040053. The reversal of 12344040021 is 12004044321.

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: 12004044321 = 3 ⋅4001348107.

It is not a de Polignac number, because 12344040021 - 2¹ = 12344040019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12344040021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12344040091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057340001 + ... + 2057340006.

It is an arithmetic number, because the mean of its divisors is an integer number (4114680008).

Almost surely, 2^12344040021 is an apocalyptic number.

It is an amenable number.

12344040021 is a deficient number, since it is larger than the sum of its proper divisors (4114680011).

12344040021 is an equidigital number, since it uses as much as digits as its factorization.

12344040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114680010.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 12344040021 its reverse (12004044321), we get a palindrome (24348084342).

The spelling of 12344040021 in words is "twelve billion, three hundred forty-four million, forty thousand, twenty-one".