12103123231 has 4 divisors (see below), whose sum is σ = 12190196200. Its totient is φ = 12016050264.

The previous prime is 12103123223. The next prime is 12103123271. The reversal of 12103123231 is 13232130121.

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

It is a cyclic number.

It is not a de Polignac number, because 12103123231 - 2³ = 12103123223 is a prime.

It is a super-2 number, since 2×12103123231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12103123199 and 12103123208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12103123271) 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, 43536276 + ... + 43536553.

It is an arithmetic number, because the mean of its divisors is an integer number (3047549050).

Almost surely, 2^12103123231 is an apocalyptic number.

12103123231 is a deficient number, since it is larger than the sum of its proper divisors (87072969).

12103123231 is an equidigital number, since it uses as much as digits as its factorization.

12103123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87072968.

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

Adding to 12103123231 its reverse (13232130121), we get a palindrome (25335253352).

The spelling of 12103123231 in words is "twelve billion, one hundred three million, one hundred twenty-three thousand, two hundred thirty-one".