330640021 has 4 divisors (see below), whose sum is σ = 350089452. Its totient is φ = 311190592.

The previous prime is 330640007. The next prime is 330640061. The reversal of 330640021 is 120046033.

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 193515921 + 137124100 = 13911^2 + 11710^2 .

It is a cyclic number.

It is not a de Polignac number, because 330640021 - 2¹¹ = 330637973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (330640001) 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, 9724690 + ... + 9724723.

It is an arithmetic number, because the mean of its divisors is an integer number (87522363).

Almost surely, 2^330640021 is an apocalyptic number.

It is an amenable number.

330640021 is a deficient number, since it is larger than the sum of its proper divisors (19449431).

330640021 is a wasteful number, since it uses less digits than its factorization.

330640021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19449430.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 330640021 is about 18183.5095897354. The cubic root of 330640021 is about 691.4887835844.

Adding to 330640021 its reverse (120046033), we get a palindrome (450686054).

The spelling of 330640021 in words is "three hundred thirty million, six hundred forty thousand, twenty-one".