6622021 has 4 divisors (see below), whose sum is σ = 7568032. Its totient is φ = 5676012.

The previous prime is 6622019. The next prime is 6622037. The reversal of 6622021 is 1202266.

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 6622021 - 2¹ = 6622019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6622021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6622081) 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, 472995 + ... + 473008.

It is an arithmetic number, because the mean of its divisors is an integer number (1892008).

Almost surely, 2^6622021 is an apocalyptic number.

It is an amenable number.

6622021 is a deficient number, since it is larger than the sum of its proper divisors (946011).

6622021 is an equidigital number, since it uses as much as digits as its factorization.

6622021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946010.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 6622021 is about 2573.3287780616. The cubic root of 6622021 is about 187.7861326094.

Adding to 6622021 its reverse (1202266), we get a palindrome (7824287).

The spelling of 6622021 in words is "six million, six hundred twenty-two thousand, twenty-one".