2131203123 has 16 divisors (see below), whose sum is σ = 3608386560. Its totient is φ = 1217830248.

The previous prime is 2131203091. The next prime is 2131203149. The reversal of 2131203123 is 3213021312.

It is not a de Polignac number, because 2131203123 - 2⁵ = 2131203091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2131203096 and 2131203105.

It is not an unprimeable number, because it can be changed into a prime (2131201123) 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 15 ways as a sum of consecutive naturals, for example, 5637915 + ... + 5638292.

It is an arithmetic number, because the mean of its divisors is an integer number (225524160).

Almost surely, 2^2131203123 is an apocalyptic number.

2131203123 is a deficient number, since it is larger than the sum of its proper divisors (1477183437).

2131203123 is a wasteful number, since it uses less digits than its factorization.

2131203123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11276223 (or 11276217 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 2131203123 is about 46164.9555723820. The cubic root of 2131203123 is about 1286.8905585564.

Adding to 2131203123 its reverse (3213021312), we get a palindrome (5344224435).

The spelling of 2131203123 in words is "two billion, one hundred thirty-one million, two hundred three thousand, one hundred twenty-three".