6424221 has 4 divisors (see below), whose sum is σ = 8565632. Its totient is φ = 4282812.

The previous prime is 6424217. The next prime is 6424237. The reversal of 6424221 is 1224246.

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 6424221 - 2² = 6424217 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 (6424241) 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, 1070701 + ... + 1070706.

It is an arithmetic number, because the mean of its divisors is an integer number (2141408).

Almost surely, 2^6424221 is an apocalyptic number.

It is an amenable number.

6424221 is a deficient number, since it is larger than the sum of its proper divisors (2141411).

6424221 is a wasteful number, since it uses less digits than its factorization.

6424221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141410.

The product of its digits is 768, while the sum is 21.

The square root of 6424221 is about 2534.6047029073. The cubic root of 6424221 is about 185.8974750041.

Adding to 6424221 its reverse (1224246), we get a palindrome (7648467).

The spelling of 6424221 in words is "six million, four hundred twenty-four thousand, two hundred twenty-one".