4845020021 has 2 divisors, whose sum is σ = 4845020022. Its totient is φ = 4845020020.

The previous prime is 4845019903. The next prime is 4845020057. The reversal of 4845020021 is 1200205484.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3870706225 + 974313796 = 62215^2 + 31214^2 .

It is a cyclic number.

It is not a de Polignac number, because 4845020021 - 2³⁰ = 3771278197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4845020321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2422510010 + 2422510011.

It is an arithmetic number, because the mean of its divisors is an integer number (2422510011).

Almost surely, 2^4845020021 is an apocalyptic number.

It is an amenable number.

4845020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4845020021 is an equidigital number, since it uses as much as digits as its factorization.

4845020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 4845020021 is about 69606.1780375851. The cubic root of 4845020021 is about 1692.1227275138.

The spelling of 4845020021 in words is "four billion, eight hundred forty-five million, twenty thousand, twenty-one".