8115021 has 24 divisors (see below), whose sum is σ = 12355200. Its totient is φ = 5122656.

The previous prime is 8115011. The next prime is 8115049. The reversal of 8115021 is 1205118.

It is not a de Polignac number, because 8115021 - 2⁷ = 8114893 is a prime.

It is a Curzon number.

8115021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8114985 and 8115003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8115011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40680 + ... + 40878.

It is an arithmetic number, because the mean of its divisors is an integer number (514800).

Almost surely, 2^8115021 is an apocalyptic number.

It is an amenable number.

8115021 is a deficient number, since it is larger than the sum of its proper divisors (4240179).

8115021 is a wasteful number, since it uses less digits than its factorization.

8115021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 8115021 is about 2848.6875925591. The cubic root of 8115021 is about 200.9539509866.

Subtracting from 8115021 its reverse (1205118), we obtain a triangular number (6909903 = T₃₇₁₇).

It can be divided in two parts, 811 and 5021, that added together give a cube (5832 = 18³).

The spelling of 8115021 in words is "eight million, one hundred fifteen thousand, twenty-one".