331221433121 has 4 divisors (see below), whose sum is σ = 350705046852. Its totient is φ = 311737819392.

The previous prime is 331221433111. The next prime is 331221433177. The reversal of 331221433121 is 121334122133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121334122133 = 7 ⋅17333446019.

It can be written as a sum of positive squares in 2 ways, for example, as 119276292496 + 211945140625 = 345364^2 + 460375^2 .

It is a cyclic number.

It is not a de Polignac number, because 331221433121 - 2³⁰ = 330147691297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331221433111) 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, 9741806840 + ... + 9741806873.

It is an arithmetic number, because the mean of its divisors is an integer number (87676261713).

Almost surely, 2^331221433121 is an apocalyptic number.

It is an amenable number.

331221433121 is a deficient number, since it is larger than the sum of its proper divisors (19483613731).

331221433121 is a wasteful number, since it uses less digits than its factorization.

331221433121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19483613730.

The product of its digits is 2592, while the sum is 26.

Adding to 331221433121 its reverse (121334122133), we get a palindrome (452555555254).

The spelling of 331221433121 in words is "three hundred thirty-one billion, two hundred twenty-one million, four hundred thirty-three thousand, one hundred twenty-one".