8125021 has 2 divisors, whose sum is σ = 8125022. Its totient is φ = 8125020.

The previous prime is 8125009. The next prime is 8125037. The reversal of 8125021 is 1205218.

8125021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6125625 + 1999396 = 2475^2 + 1414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8125021 is a prime.

It is a super-3 number, since 3×8125021³ (a number of 22 digits) contains 333 as substring.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 8125021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8125081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4062510 + 4062511.

It is an arithmetic number, because the mean of its divisors is an integer number (4062511).

Almost surely, 2^8125021 is an apocalyptic number.

It is an amenable number.

8125021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8125021 is an equidigital number, since it uses as much as digits as its factorization.

8125021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 8125021 is about 2850.4422463891. The cubic root of 8125021 is about 201.0364611298.

The spelling of 8125021 in words is "eight million, one hundred twenty-five thousand, twenty-one".