2845564021 has 2 divisors, whose sum is σ = 2845564022. Its totient is φ = 2845564020.

The previous prime is 2845564019. The next prime is 2845564037. The reversal of 2845564021 is 1204655482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1775358225 + 1070205796 = 42135^2 + 32714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2845564021 - 2¹ = 2845564019 is a prime.

Together with 2845564019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2845564321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1422782010 + 1422782011.

It is an arithmetic number, because the mean of its divisors is an integer number (1422782011).

Almost surely, 2^2845564021 is an apocalyptic number.

It is an amenable number.

2845564021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2845564021 is an equidigital number, since it uses as much as digits as its factorization.

2845564021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 37.

The square root of 2845564021 is about 53343.8283309325. The cubic root of 2845564021 is about 1417.0639628000.

The spelling of 2845564021 in words is "two billion, eight hundred forty-five million, five hundred sixty-four thousand, twenty-one".