8009765021 has 2 divisors, whose sum is σ = 8009765022. Its totient is φ = 8009765020.

The previous prime is 8009764991. The next prime is 8009765059. The reversal of 8009765021 is 1205679008.

It is an a-pointer prime, because the next prime (8009765059) can be obtained adding 8009765021 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6286269796 + 1723495225 = 79286^2 + 41515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8009765021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8009765321) 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, 4004882510 + 4004882511.

It is an arithmetic number, because the mean of its divisors is an integer number (4004882511).

Almost surely, 2^8009765021 is an apocalyptic number.

It is an amenable number.

8009765021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8009765021 is an equidigital number, since it uses as much as digits as its factorization.

8009765021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 8009765021 is about 89497.2905791008. The cubic root of 8009765021 is about 2000.8134208784.

The spelling of 8009765021 in words is "eight billion, nine million, seven hundred sixty-five thousand, twenty-one".