4527809021 has 2 divisors, whose sum is σ = 4527809022. Its totient is φ = 4527809020.

The previous prime is 4527809009. The next prime is 4527809057. The reversal of 4527809021 is 1209087254.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4527405796 + 403225 = 67286^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 4527809021 - 2²² = 4523614717 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 (4527800021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2263904510 + 2263904511.

It is an arithmetic number, because the mean of its divisors is an integer number (2263904511).

Almost surely, 2^4527809021 is an apocalyptic number.

It is an amenable number.

4527809021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4527809021 is an equidigital number, since it uses as much as digits as its factorization.

4527809021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 4527809021 is about 67288.9962846824. The cubic root of 4527809021 is about 1654.3575082051.

The spelling of 4527809021 in words is "four billion, five hundred twenty-seven million, eight hundred nine thousand, twenty-one".