12121303123 has 4 divisors (see below), whose sum is σ = 12122816368. Its totient is φ = 12119789880.

The previous prime is 12121303121. The next prime is 12121303141. The reversal of 12121303123 is 32130312121.

12121303123 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, and also an emirpimes, since its reverse is a distinct semiprime: 32130312121 = 19 ⋅1691069059.

It is a cyclic number.

It is not a de Polignac number, because 12121303123 - 2¹ = 12121303121 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 12121303123.

It is not an unprimeable number, because it can be changed into a prime (12121303121) 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, 744543 + ... + 760648.

It is an arithmetic number, because the mean of its divisors is an integer number (3030704092).

Almost surely, 2^12121303123 is an apocalyptic number.

12121303123 is a deficient number, since it is larger than the sum of its proper divisors (1513245).

12121303123 is an equidigital number, since it uses as much as digits as its factorization.

12121303123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513244.

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

Adding to 12121303123 its reverse (32130312121), we get a palindrome (44251615244).

The spelling of 12121303123 in words is "twelve billion, one hundred twenty-one million, three hundred three thousand, one hundred twenty-three".