12020312123 has 4 divisors (see below), whose sum is σ = 12021016920. Its totient is φ = 12019607328.

The previous prime is 12020312069. The next prime is 12020312131. The reversal of 12020312123 is 32121302021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32121302021 = 5039 ⋅6374539.

It is a cyclic number.

It is not a de Polignac number, because 12020312123 - 2²⁰ = 12019263547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12020312153) 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, 326165 + ... + 361142.

It is an arithmetic number, because the mean of its divisors is an integer number (3005254230).

Almost surely, 2^12020312123 is an apocalyptic number.

12020312123 is a deficient number, since it is larger than the sum of its proper divisors (704797).

12020312123 is an equidigital number, since it uses as much as digits as its factorization.

12020312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704796.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 12020312123 its reverse (32121302021), we get a palindrome (44141614144).

The spelling of 12020312123 in words is "twelve billion, twenty million, three hundred twelve thousand, one hundred twenty-three".