131305500350221 has 4 divisors (see below), whose sum is σ = 131305542897852. Its totient is φ = 131305457802592.

The previous prime is 131305500350201. The next prime is 131305500350279. The reversal of 131305500350221 is 122053005503131.

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 51185296272100 + 80120204078121 = 7154390^2 + 8950989^2 .

It is a cyclic number.

It is not a de Polignac number, because 131305500350221 - 2⁷ = 131305500350093 is a prime.

It is a super-2 number, since 2×131305500350221² (a number of 29 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 (131305500350201) 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, 16249090 + ... + 22948723.

It is an arithmetic number, because the mean of its divisors is an integer number (32826385724463).

Almost surely, 2^{131305500350221} is an apocalyptic number.

It is an amenable number.

131305500350221 is a deficient number, since it is larger than the sum of its proper divisors (42547631).

131305500350221 is an equidigital number, since it uses as much as digits as its factorization.

131305500350221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42547630.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 131305500350221 its reverse (122053005503131), we get a palindrome (253358505853352).

The spelling of 131305500350221 in words is "one hundred thirty-one trillion, three hundred five billion, five hundred million, three hundred fifty thousand, two hundred twenty-one".