331332021 has 6 divisors (see below), whose sum is σ = 478590710. Its totient is φ = 220888008.

The previous prime is 331332019. The next prime is 331332031. The reversal of 331332021 is 120233133.

331332021 is a `hidden beast` number, since 331 + 332 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 293951025 + 37380996 = 17145^2 + 6114^2 .

It is not a de Polignac number, because 331332021 - 2¹ = 331332019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331331985 and 331332003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331332011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18407326 + ... + 18407343.

Almost surely, 2^331332021 is an apocalyptic number.

It is an amenable number.

331332021 is a deficient number, since it is larger than the sum of its proper divisors (147258689).

331332021 is a wasteful number, since it uses less digits than its factorization.

331332021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36814675 (or 36814672 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 331332021 is about 18202.5278738971. The cubic root of 331332021 is about 691.9708554946.

Adding to 331332021 its reverse (120233133), we get a palindrome (451565154).

The spelling of 331332021 in words is "three hundred thirty-one million, three hundred thirty-two thousand, twenty-one".