331033020221 has 4 divisors (see below), whose sum is σ = 331034171100. Its totient is φ = 331031869344.

The previous prime is 331033020209. The next prime is 331033020239. The reversal of 331033020221 is 122020330133.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 219553159225 + 111479860996 = 468565^2 + 333886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331033020221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331033020193 and 331033020202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331033020821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272945 + ... + 858233.

It is an arithmetic number, because the mean of its divisors is an integer number (82758542775).

Almost surely, 2^331033020221 is an apocalyptic number.

It is an amenable number.

331033020221 is a deficient number, since it is larger than the sum of its proper divisors (1150879).

331033020221 is an equidigital number, since it uses as much as digits as its factorization.

331033020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150878.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 331033020221 its reverse (122020330133), we get a palindrome (453053350354).

The spelling of 331033020221 in words is "three hundred thirty-one billion, thirty-three million, twenty thousand, two hundred twenty-one".