123210312131 has 4 divisors (see below), whose sum is σ = 123225620112. Its totient is φ = 123195004152.

The previous prime is 123210312061. The next prime is 123210312143. The reversal of 123210312131 is 131213012321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131213012321 = 2213 ⋅59291917.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123210312131 is a prime.

It is a super-2 number, since 2×123210312131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123210312331) 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, 7641911 + ... + 7658016.

It is an arithmetic number, because the mean of its divisors is an integer number (30806405028).

Almost surely, 2^123210312131 is an apocalyptic number.

123210312131 is a deficient number, since it is larger than the sum of its proper divisors (15307981).

123210312131 is an equidigital number, since it uses as much as digits as its factorization.

123210312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15307980.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 123210312131 its reverse (131213012321), we get a palindrome (254423324452).

The spelling of 123210312131 in words is "one hundred twenty-three billion, two hundred ten million, three hundred twelve thousand, one hundred thirty-one".