131210123213 has 4 divisors (see below), whose sum is σ = 141303209628. Its totient is φ = 121117036800.

The previous prime is 131210123171. The next prime is 131210123227. The reversal of 131210123213 is 312321012131.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 79850326084 + 51359797129 = 282578^2 + 226627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131210123213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131210123273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5046543188 + ... + 5046543213.

It is an arithmetic number, because the mean of its divisors is an integer number (35325802407).

Almost surely, 2^131210123213 is an apocalyptic number.

131210123213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

131210123213 is a deficient number, since it is larger than the sum of its proper divisors (10093086415).

131210123213 is a wasteful number, since it uses less digits than its factorization.

131210123213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10093086414.

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

Adding to 131210123213 its reverse (312321012131), we get a palindrome (443531135344).

The spelling of 131210123213 in words is "one hundred thirty-one billion, two hundred ten million, one hundred twenty-three thousand, two hundred thirteen".