6601021 has 4 divisors (see below), whose sum is σ = 7544032. Its totient is φ = 5658012.

The previous prime is 6601019. The next prime is 6601031. The reversal of 6601021 is 1201066.

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 a cyclic number.

It is not a de Polignac number, because 6601021 - 2¹ = 6601019 is a prime.

It is a Duffinian number.

6601021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6600986 and 6601004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6601031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471495 + ... + 471508.

It is an arithmetic number, because the mean of its divisors is an integer number (1886008).

Almost surely, 2^6601021 is an apocalyptic number.

It is an amenable number.

6601021 is a deficient number, since it is larger than the sum of its proper divisors (943011).

6601021 is an equidigital number, since it uses as much as digits as its factorization.

6601021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943010.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 6601021 is about 2569.2452199041. The cubic root of 6601021 is about 187.5874176076.

Adding to 6601021 its reverse (1201066), we get a palindrome (7802087).

It can be divided in two parts, 660 and 1021, that added together give a square (1681 = 41²).

The spelling of 6601021 in words is "six million, six hundred one thousand, twenty-one".