8105021 has 2 divisors, whose sum is σ = 8105022. Its totient is φ = 8105020.

The previous prime is 8105017. The next prime is 8105047. The reversal of 8105021 is 1205018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5112121 + 2992900 = 2261^2 + 1730^2 .

It is a cyclic number.

It is not a de Polignac number, because 8105021 - 2² = 8105017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8105051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4052510 + 4052511.

It is an arithmetic number, because the mean of its divisors is an integer number (4052511).

Almost surely, 2^8105021 is an apocalyptic number.

It is an amenable number.

8105021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8105021 is an equidigital number, since it uses as much as digits as its factorization.

8105021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 8105021 is about 2846.9318572807. The cubic root of 8105021 is about 200.8713730317.

The spelling of 8105021 in words is "eight million, one hundred five thousand, twenty-one".