6606021 has 4 divisors (see below), whose sum is σ = 8808032. Its totient is φ = 4404012.

The previous prime is 6606011. The next prime is 6606023. The reversal of 6606021 is 1206066.

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.

It is not a de Polignac number, because 6606021 - 2¹⁸ = 6343877 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6606023) 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, 1101001 + ... + 1101006.

It is an arithmetic number, because the mean of its divisors is an integer number (2202008).

Almost surely, 2^6606021 is an apocalyptic number.

It is an amenable number.

6606021 is a deficient number, since it is larger than the sum of its proper divisors (2202011).

6606021 is a wasteful number, since it uses less digits than its factorization.

6606021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202010.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 6606021 is about 2570.2180841322. The cubic root of 6606021 is about 187.6347688871.

The spelling of 6606021 in words is "six million, six hundred six thousand, twenty-one".