4418967821 has 2 divisors, whose sum is σ = 4418967822. Its totient is φ = 4418967820.

The previous prime is 4418967727. The next prime is 4418967827. The reversal of 4418967821 is 1287698144.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3515304100 + 903663721 = 59290^2 + 30061^2 .

It is a cyclic number.

It is not a de Polignac number, because 4418967821 - 2³⁰ = 3345225997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4418967821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4418967827) 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, 2209483910 + 2209483911.

It is an arithmetic number, because the mean of its divisors is an integer number (2209483911).

Almost surely, 2^4418967821 is an apocalyptic number.

It is an amenable number.

4418967821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4418967821 is an equidigital number, since it uses as much as digits as its factorization.

4418967821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 50.

The square root of 4418967821 is about 66475.3173817170. The cubic root of 4418967821 is about 1640.9938231968.

The spelling of 4418967821 in words is "four billion, four hundred eighteen million, nine hundred sixty-seven thousand, eight hundred twenty-one".