8307357021 has 12 divisors (see below), whose sum is σ = 12001296060. Its totient is φ = 5537416320.

The previous prime is 8307357017. The next prime is 8307357043. The reversal of 8307357021 is 1207537038.

8307357021 is a `hidden beast` number, since 83 + 0 + 7 + 3 + 570 + 2 + 1 = 666.

8307357021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3339221796 + 4968135225 = 57786^2 + 70485^2 .

It is not a de Polignac number, because 8307357021 - 2² = 8307357017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8307357521) 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 in 11 ways as a sum of consecutive naturals, for example, 940 + ... + 128901.

It is an arithmetic number, because the mean of its divisors is an integer number (1000108005).

Almost surely, 2^8307357021 is an apocalyptic number.

It is an amenable number.

8307357021 is a deficient number, since it is larger than the sum of its proper divisors (3693939039).

8307357021 is a wasteful number, since it uses less digits than its factorization.

8307357021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136956 (or 136953 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 8307357021 is about 91144.7037462956. The cubic root of 8307357021 is about 2025.2918968338.

The spelling of 8307357021 in words is "eight billion, three hundred seven million, three hundred fifty-seven thousand, twenty-one".