8636021 has 2 divisors, whose sum is σ = 8636022. Its totient is φ = 8636020.

The previous prime is 8635999. The next prime is 8636039. The reversal of 8636021 is 1206368.

8636021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7761796 + 874225 = 2786^2 + 935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8636021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8636081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4318010 + 4318011.

It is an arithmetic number, because the mean of its divisors is an integer number (4318011).

Almost surely, 2^8636021 is an apocalyptic number.

It is an amenable number.

8636021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8636021 is an equidigital number, since it uses as much as digits as its factorization.

8636021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 8636021 is about 2938.7107717501. The cubic root of 8636021 is about 205.1656087908.

It can be divided in two parts, 86360 and 21, that multiplied together give a triangular number (1813560 = T₁₉₀₄).

The spelling of 8636021 in words is "eight million, six hundred thirty-six thousand, twenty-one".