331121330223221 has 4 divisors (see below), whose sum is σ = 342539307127500. Its totient is φ = 319703353318944.

The previous prime is 331121330223193. The next prime is 331121330223223. The reversal of 331121330223221 is 122322033121133.

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 112569871911025 + 218551458312196 = 10609895^2 + 14783486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331121330223221 is a prime.

It is a super-2 number, since 2×331121330223221² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 11417976904249 = 331121330223221 / (3 + 3 + 1 + 1 + 2 + 1 + 3 + 3 + 0 + 2 + 2 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331121330223223) 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, 5708988452096 + ... + 5708988452153.

It is an arithmetic number, because the mean of its divisors is an integer number (85634826781875).

Almost surely, 2^{331121330223221} is an apocalyptic number.

It is an amenable number.

331121330223221 is a deficient number, since it is larger than the sum of its proper divisors (11417976904279).

331121330223221 is a wasteful number, since it uses less digits than its factorization.

331121330223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11417976904278.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 331121330223221 its reverse (122322033121133), we get a palindrome (453443363344354).

The spelling of 331121330223221 in words is "three hundred thirty-one trillion, one hundred twenty-one billion, three hundred thirty million, two hundred twenty-three thousand, two hundred twenty-one".