131021123231 has 4 divisors (see below), whose sum is σ = 133808806752. Its totient is φ = 128233439712.

The previous prime is 131021123203. The next prime is 131021123279. The reversal of 131021123231 is 132321120131.

It is a happy number.

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 131021123231 - 2¹⁸ = 131020861087 is a prime.

It is a super-2 number, since 2×131021123231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021123201) 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, 1393841690 + ... + 1393841783.

It is an arithmetic number, because the mean of its divisors is an integer number (33452201688).

Almost surely, 2^131021123231 is an apocalyptic number.

131021123231 is a deficient number, since it is larger than the sum of its proper divisors (2787683521).

131021123231 is an equidigital number, since it uses as much as digits as its factorization.

131021123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787683520.

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

Adding to 131021123231 its reverse (132321120131), we get a palindrome (263342243362).

The spelling of 131021123231 in words is "one hundred thirty-one billion, twenty-one million, one hundred twenty-three thousand, two hundred thirty-one".