131325434355221 has 4 divisors (see below), whose sum is σ = 131334881562444. Its totient is φ = 131315987148000.

The previous prime is 131325434355217. The next prime is 131325434355239. The reversal of 131325434355221 is 122553434523131.

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 72991904860900 + 58333529494321 = 8543530^2 + 7637639^2 .

It is a cyclic number.

It is not a de Polignac number, because 131325434355221 - 2² = 131325434355217 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 (131325434355281) 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, 4723582760 + ... + 4723610561.

It is an arithmetic number, because the mean of its divisors is an integer number (32833720390611).

Almost surely, 2^{131325434355221} is an apocalyptic number.

It is an amenable number.

131325434355221 is a deficient number, since it is larger than the sum of its proper divisors (9447207223).

131325434355221 is an equidigital number, since it uses as much as digits as its factorization.

131325434355221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9447207222.

The product of its digits is 1296000, while the sum is 44.

Adding to 131325434355221 its reverse (122553434523131), we get a palindrome (253878868878352).

The spelling of 131325434355221 in words is "one hundred thirty-one trillion, three hundred twenty-five billion, four hundred thirty-four million, three hundred fifty-five thousand, two hundred twenty-one".