8772945021 has 6 divisors (see below), whose sum is σ = 12672031710. Its totient is φ = 5848630008.

The previous prime is 8772945007. The next prime is 8772945043. The reversal of 8772945021 is 1205492778.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7829595225 + 943349796 = 88485^2 + 30714^2 .

It is not a de Polignac number, because 8772945021 - 2⁷ = 8772944893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8772945721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 487385826 + ... + 487385843.

It is an arithmetic number, because the mean of its divisors is an integer number (2112005285).

Almost surely, 2^8772945021 is an apocalyptic number.

It is an amenable number.

8772945021 is a deficient number, since it is larger than the sum of its proper divisors (3899086689).

8772945021 is a wasteful number, since it uses less digits than its factorization.

8772945021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974771675 (or 974771672 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 8772945021 is about 93664.0006672788. Note that the first 3 decimals coincide. The cubic root of 8772945021 is about 2062.4422773487.

The spelling of 8772945021 in words is "eight billion, seven hundred seventy-two million, nine hundred forty-five thousand, twenty-one".