330404021 has 4 divisors (see below), whose sum is σ = 330611232. Its totient is φ = 330196812.

The previous prime is 330403987. The next prime is 330404023. The reversal of 330404021 is 120404033.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120404033 = 83 ⋅1450651.

It is a cyclic number.

It is not a de Polignac number, because 330404021 - 2²⁶ = 263295157 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 (330404023) 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, 101195 + ... + 104408.

It is an arithmetic number, because the mean of its divisors is an integer number (82652808).

Almost surely, 2^330404021 is an apocalyptic number.

It is an amenable number.

330404021 is a deficient number, since it is larger than the sum of its proper divisors (207211).

330404021 is a wasteful number, since it uses less digits than its factorization.

330404021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207210.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 330404021 is about 18177.0190350343. The cubic root of 330404021 is about 691.3242237562.

Adding to 330404021 its reverse (120404033), we get a palindrome (450808054).

The spelling of 330404021 in words is "three hundred thirty million, four hundred four thousand, twenty-one".