12321020123 has 4 divisors (see below), whose sum is σ = 12321250608. Its totient is φ = 12320789640.

The previous prime is 12321020099. The next prime is 12321020161. The reversal of 12321020123 is 32102012321.

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-12321020123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12321020423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11153 + ... + 157373.

It is an arithmetic number, because the mean of its divisors is an integer number (3080312652).

Almost surely, 2^12321020123 is an apocalyptic number.

12321020123 is a deficient number, since it is larger than the sum of its proper divisors (230485).

12321020123 is an equidigital number, since it uses as much as digits as its factorization.

12321020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230484.

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

Adding to 12321020123 its reverse (32102012321), we get a palindrome (44423032444).

The spelling of 12321020123 in words is "twelve billion, three hundred twenty-one million, twenty thousand, one hundred twenty-three".