6622221 has 8 divisors (see below), whose sum is σ = 8974624. Its totient is φ = 4342320.

The previous prime is 6622211. The next prime is 6622283. The reversal of 6622221 is 1222266.

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

It is not a de Polignac number, because 6622221 - 2⁶ = 6622157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6622211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17911 + ... + 18276.

It is an arithmetic number, because the mean of its divisors is an integer number (1121828).

Almost surely, 2^6622221 is an apocalyptic number.

6622221 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6622221 is a deficient number, since it is larger than the sum of its proper divisors (2352403).

6622221 is a wasteful number, since it uses less digits than its factorization.

6622221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36251.

The product of its digits is 576, while the sum is 21.

The square root of 6622221 is about 2573.3676379406. The cubic root of 6622221 is about 187.7880231122.

Adding to 6622221 its reverse (1222266), we get a palindrome (7844487).

The spelling of 6622221 in words is "six million, six hundred twenty-two thousand, two hundred twenty-one".