6605421 has 4 divisors (see below), whose sum is σ = 8807232. Its totient is φ = 4403612.

The previous prime is 6605411. The next prime is 6605429. The reversal of 6605421 is 1245066.

6605421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6605421 - 2¹⁰ = 6604397 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 6605391 and 6605400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6605429) 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, 1100901 + ... + 1100906.

It is an arithmetic number, because the mean of its divisors is an integer number (2201808).

Almost surely, 2^6605421 is an apocalyptic number.

It is an amenable number.

6605421 is a deficient number, since it is larger than the sum of its proper divisors (2201811).

6605421 is a wasteful number, since it uses less digits than its factorization.

6605421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201810.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 6605421 is about 2570.1013598689. The cubic root of 6605421 is about 187.6290879954.

The spelling of 6605421 in words is "six million, six hundred five thousand, four hundred twenty-one".