331132313112221 has 4 divisors (see below), whose sum is σ = 331132373336700. Its totient is φ = 331132252887744.

The previous prime is 331132313112193. The next prime is 331132313112247. The reversal of 331132313112221 is 122211313231133.

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 226105685049721 + 105026628062500 = 15036811^2 + 10248250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331132313112221 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 (331132313102221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20931836 + ... + 33172373.

It is an arithmetic number, because the mean of its divisors is an integer number (82783093334175).

Almost surely, 2^{331132313112221} is an apocalyptic number.

It is an amenable number.

331132313112221 is a deficient number, since it is larger than the sum of its proper divisors (60224479).

331132313112221 is an equidigital number, since it uses as much as digits as its factorization.

331132313112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60224478.

The product of its digits is 3888, while the sum is 29.

Adding to 331132313112221 its reverse (122211313231133), we get a palindrome (453343626343354).

The spelling of 331132313112221 in words is "three hundred thirty-one trillion, one hundred thirty-two billion, three hundred thirteen million, one hundred twelve thousand, two hundred twenty-one".