331042021 has 2 divisors, whose sum is σ = 331042022. Its totient is φ = 331042020.

The previous prime is 331042001. The next prime is 331042031. The reversal of 331042021 is 120240133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 325802500 + 5239521 = 18050^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 331042021 - 2⁹ = 331041509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331041986 and 331042004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331042001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165521010 + 165521011.

It is an arithmetic number, because the mean of its divisors is an integer number (165521011).

Almost surely, 2^331042021 is an apocalyptic number.

It is an amenable number.

331042021 is a deficient number, since it is larger than the sum of its proper divisors (1).

331042021 is an equidigital number, since it uses as much as digits as its factorization.

331042021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 331042021 is about 18194.5602035334. The cubic root of 331042021 is about 691.7689129213.

Adding to 331042021 its reverse (120240133), we get a palindrome (451282154).

The spelling of 331042021 in words is "three hundred thirty-one million, forty-two thousand, twenty-one".