131321231244021 has 24 divisors (see below), whose sum is σ = 219349748894304. Its totient is φ = 69268341754080.

The previous prime is 131321231243999. The next prime is 131321231244029. The reversal of 131321231244021 is 120442132123131.

It is not a de Polignac number, because 131321231244021 - 2⁵ = 131321231243989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131321231244021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131321231244029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34359294595 + ... + 34359298416.

It is an arithmetic number, because the mean of its divisors is an integer number (9139572870596).

Almost surely, 2^{131321231244021} is an apocalyptic number.

It is an amenable number.

131321231244021 is a deficient number, since it is larger than the sum of its proper divisors (88028517650283).

131321231244021 is a wasteful number, since it uses less digits than its factorization.

131321231244021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68718593041 (or 68718593034 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 131321231244021 its reverse (120442132123131), we get a palindrome (251763363367152).

The spelling of 131321231244021 in words is "one hundred thirty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred forty-four thousand, twenty-one".