131221304221 has 8 divisors (see below), whose sum is σ = 153157996800. Its totient is φ = 110082309648.

The previous prime is 131221304219. The next prime is 131221304237. The reversal of 131221304221 is 122403122131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131221304221 - 2¹ = 131221304219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131221304192 and 131221304201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221304251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199424146 + ... + 199424803.

It is an arithmetic number, because the mean of its divisors is an integer number (19144749600).

Almost surely, 2^131221304221 is an apocalyptic number.

It is an amenable number.

131221304221 is a deficient number, since it is larger than the sum of its proper divisors (21936692579).

131221304221 is an equidigital number, since it uses as much as digits as its factorization.

131221304221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398849003.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 131221304221 its reverse (122403122131), we get a palindrome (253624426352).

The spelling of 131221304221 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred four thousand, two hundred twenty-one".