2204404021 has 2 divisors, whose sum is σ = 2204404022. Its totient is φ = 2204404020.

The previous prime is 2204404009. The next prime is 2204404063. The reversal of 2204404021 is 1204044022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1972603396 + 231800625 = 44414^2 + 15225^2 .

It is a cyclic number.

It is not a de Polignac number, because 2204404021 - 2⁵ = 2204403989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2204404021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2204404001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102202010 + 1102202011.

It is an arithmetic number, because the mean of its divisors is an integer number (1102202011).

Almost surely, 2^2204404021 is an apocalyptic number.

It is an amenable number.

2204404021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2204404021 is an equidigital number, since it uses as much as digits as its factorization.

2204404021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 2204404021 is about 46951.0811483612. The cubic root of 2204404021 is about 1301.4587217370.

Adding to 2204404021 its reverse (1204044022), we get a palindrome (3408448043).

The spelling of 2204404021 in words is "two billion, two hundred four million, four hundred four thousand, twenty-one".