330434021 has 2 divisors, whose sum is σ = 330434022. Its totient is φ = 330434020.

The previous prime is 330434009. The next prime is 330434023. The reversal of 330434021 is 120434033.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327103396 + 3330625 = 18086^2 + 1825^2 .

It is an emirp because it is prime and its reverse (120434033) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-330434021 is a prime.

Together with 330434023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 330433984 and 330434002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (330434023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165217010 + 165217011.

It is an arithmetic number, because the mean of its divisors is an integer number (165217011).

Almost surely, 2^330434021 is an apocalyptic number.

It is an amenable number.

330434021 is a deficient number, since it is larger than the sum of its proper divisors (1).

330434021 is an equidigital number, since it uses as much as digits as its factorization.

330434021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 330434021 is about 18177.8442341219. The cubic root of 330434021 is about 691.3451467250.

Adding to 330434021 its reverse (120434033), we get a palindrome (450868054).

The spelling of 330434021 in words is "three hundred thirty million, four hundred thirty-four thousand, twenty-one".