6730021 has 4 divisors (see below), whose sum is σ = 6738732. Its totient is φ = 6721312.

The previous prime is 6729991. The next prime is 6730033. The reversal of 6730021 is 1200376.

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 2927521 + 3802500 = 1711^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 6730021 - 2⁹ = 6729509 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 (6730051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3070 + ... + 4783.

It is an arithmetic number, because the mean of its divisors is an integer number (1684683).

Almost surely, 2^6730021 is an apocalyptic number.

It is an amenable number.

6730021 is a deficient number, since it is larger than the sum of its proper divisors (8711).

6730021 is an equidigital number, since it uses as much as digits as its factorization.

6730021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8710.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 6730021 is about 2594.2284016640. The cubic root of 6730021 is about 188.8015142348.

Adding to 6730021 its reverse (1200376), we get a palindrome (7930397).

The spelling of 6730021 in words is "six million, seven hundred thirty thousand, twenty-one".