6669421 has 4 divisors (see below), whose sum is σ = 7275744. Its totient is φ = 6063100.

The previous prime is 6669413. The next prime is 6669451. The reversal of 6669421 is 1249666.

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 6669421 - 2³ = 6669413 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 (6669401) 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, 303145 + ... + 303166.

It is an arithmetic number, because the mean of its divisors is an integer number (1818936).

Almost surely, 2^6669421 is an apocalyptic number.

It is an amenable number.

6669421 is a deficient number, since it is larger than the sum of its proper divisors (606323).

6669421 is a wasteful number, since it uses less digits than its factorization.

6669421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606322.

The product of its digits is 15552, while the sum is 34.

The square root of 6669421 is about 2582.5222167486. The cubic root of 6669421 is about 188.2331214765.

The spelling of 6669421 in words is "six million, six hundred sixty-nine thousand, four hundred twenty-one".