2131331323123 has 4 divisors (see below), whose sum is σ = 2131334243280. Its totient is φ = 2131328402968.

The previous prime is 2131331323111. The next prime is 2131331323129. The reversal of 2131331323123 is 3213231331312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131331323123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131331323091 and 2131331323100.

It is not an unprimeable number, because it can be changed into a prime (2131331323129) 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, 696618 + ... + 2178976.

It is an arithmetic number, because the mean of its divisors is an integer number (532833560820).

Almost surely, 2^{2131331323123} is an apocalyptic number.

2131331323123 is a deficient number, since it is larger than the sum of its proper divisors (2920157).

2131331323123 is a wasteful number, since it uses less digits than its factorization.

2131331323123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920156.

The product of its digits is 5832, while the sum is 28.

Adding to 2131331323123 its reverse (3213231331312), we get a palindrome (5344562654435).

The spelling of 2131331323123 in words is "two trillion, one hundred thirty-one billion, three hundred thirty-one million, three hundred twenty-three thousand, one hundred twenty-three".