8102021 has 4 divisors (see below), whose sum is σ = 8115852. Its totient is φ = 8088192.

The previous prime is 8102009. The next prime is 8102041. The reversal of 8102021 is 1202018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1079521 + 7022500 = 1039^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 8102021 - 2¹⁸ = 7839877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8101987 and 8102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8102041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5996 + ... + 7221.

It is an arithmetic number, because the mean of its divisors is an integer number (2028963).

Almost surely, 2^8102021 is an apocalyptic number.

It is an amenable number.

8102021 is a deficient number, since it is larger than the sum of its proper divisors (13831).

8102021 is a wasteful number, since it uses less digits than its factorization.

8102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13830.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 8102021 is about 2846.4049255157. The cubic root of 8102021 is about 200.8465864010.

Adding to 8102021 its reverse (1202018), we get a palindrome (9304039).

The spelling of 8102021 in words is "eight million, one hundred two thousand, twenty-one".