12343340021 has 4 divisors (see below), whose sum is σ = 12348052044. Its totient is φ = 12338628000.

The previous prime is 12343340003. The next prime is 12343340033. The reversal of 12343340021 is 12004334321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10262703025 + 2080636996 = 101305^2 + 45614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12343340021 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 (12343340921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2352080 + ... + 2357321.

It is an arithmetic number, because the mean of its divisors is an integer number (3087013011).

Almost surely, 2^12343340021 is an apocalyptic number.

It is an amenable number.

12343340021 is a deficient number, since it is larger than the sum of its proper divisors (4712023).

12343340021 is an equidigital number, since it uses as much as digits as its factorization.

12343340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712022.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 12343340021 its reverse (12004334321), we get a palindrome (24347674342).

The spelling of 12343340021 in words is "twelve billion, three hundred forty-three million, three hundred forty thousand, twenty-one".