12021313123 has 4 divisors (see below), whose sum is σ = 12021636568. Its totient is φ = 12020989680.

The previous prime is 12021313049. The next prime is 12021313153. The reversal of 12021313123 is 32131312021.

12021313123 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021313123 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 12021313123.

It is not an unprimeable number, because it can be changed into a prime (12021313153) 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, 97461 + ... + 183142.

It is an arithmetic number, because the mean of its divisors is an integer number (3005409142).

Almost surely, 2^12021313123 is an apocalyptic number.

12021313123 is a deficient number, since it is larger than the sum of its proper divisors (323445).

12021313123 is an equidigital number, since it uses as much as digits as its factorization.

12021313123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323444.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12021313123 its reverse (32131312021), we get a palindrome (44152625144).

The spelling of 12021313123 in words is "twelve billion, twenty-one million, three hundred thirteen thousand, one hundred twenty-three".