131330331221 has 4 divisors (see below), whose sum is σ = 131331279744. Its totient is φ = 131329382700.

The previous prime is 131330331173. The next prime is 131330331229. The reversal of 131330331221 is 122133033131.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 131330331221 - 2¹⁴ = 131330314837 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 (131330331229) 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, 221765 + ... + 558426.

It is an arithmetic number, because the mean of its divisors is an integer number (32832819936).

Almost surely, 2^131330331221 is an apocalyptic number.

It is an amenable number.

131330331221 is a deficient number, since it is larger than the sum of its proper divisors (948523).

131330331221 is an equidigital number, since it uses as much as digits as its factorization.

131330331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948522.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 131330331221 its reverse (122133033131), we get a palindrome (253463364352).

The spelling of 131330331221 in words is "one hundred thirty-one billion, three hundred thirty million, three hundred thirty-one thousand, two hundred twenty-one".