131444530221 has 4 divisors (see below), whose sum is σ = 175259373632. Its totient is φ = 87629686812.

The previous prime is 131444530207. The next prime is 131444530229. The reversal of 131444530221 is 122035444131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122035444131 = 3 ⋅40678481377.

It is not a de Polignac number, because 131444530221 - 2³⁴ = 114264661037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131444530229) 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, 21907421701 + ... + 21907421706.

It is an arithmetic number, because the mean of its divisors is an integer number (43814843408).

Almost surely, 2^131444530221 is an apocalyptic number.

It is an amenable number.

131444530221 is a deficient number, since it is larger than the sum of its proper divisors (43814843411).

131444530221 is an equidigital number, since it uses as much as digits as its factorization.

131444530221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43814843410.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 131444530221 its reverse (122035444131), we get a palindrome (253479974352).

The spelling of 131444530221 in words is "one hundred thirty-one billion, four hundred forty-four million, five hundred thirty thousand, two hundred twenty-one".