6600022021 has 2 divisors, whose sum is σ = 6600022022. Its totient is φ = 6600022020.

The previous prime is 6600022019. The next prime is 6600022061. The reversal of 6600022021 is 1202200066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5147345025 + 1452676996 = 71745^2 + 38114^2 .

It is a cyclic number.

It is not a de Polignac number, because 6600022021 - 2¹ = 6600022019 is a prime.

Together with 6600022019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6600022021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6600022061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300011010 + 3300011011.

It is an arithmetic number, because the mean of its divisors is an integer number (3300011011).

Almost surely, 2^6600022021 is an apocalyptic number.

It is an amenable number.

6600022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6600022021 is an equidigital number, since it uses as much as digits as its factorization.

6600022021 is an evil number, because the sum of its binary digits is even.

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

The square root of 6600022021 is about 81240.5195761327. The cubic root of 6600022021 is about 1875.7795415512.

Adding to 6600022021 its reverse (1202200066), we get a palindrome (7802222087).

The spelling of 6600022021 in words is "six billion, six hundred million, twenty-two thousand, twenty-one".