6422821 has 8 divisors (see below), whose sum is σ = 6903360. Its totient is φ = 5953728.

The previous prime is 6422813. The next prime is 6422837. The reversal of 6422821 is 1282246.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6422821 - 2³ = 6422813 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6² + 4⁴ + 2¹⁷ + 2²¹ + 8⁷ + 2²¹ + 1 .

6422821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6423821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1681 + ... + 3958.

It is an arithmetic number, because the mean of its divisors is an integer number (862920).

Almost surely, 2^6422821 is an apocalyptic number.

It is an amenable number.

6422821 is a deficient number, since it is larger than the sum of its proper divisors (480539).

6422821 is a wasteful number, since it uses less digits than its factorization.

6422821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5723.

The product of its digits is 1536, while the sum is 25.

The square root of 6422821 is about 2534.3285106710. The cubic root of 6422821 is about 185.8839701049.

The spelling of 6422821 in words is "six million, four hundred twenty-two thousand, eight hundred twenty-one".