868021 has 8 divisors (see below), whose sum is σ = 1082304. Its totient is φ = 676320.

The previous prime is 868019. The next prime is 868033. The reversal of 868021 is 120868.

868021 = T₁₁₀ + T₁₁₁ + ... + T₁₈₆.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 868021 - 2¹ = 868019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5560 + ... + 5713.

It is an arithmetic number, because the mean of its divisors is an integer number (135288).

2⁸⁶⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

868021 is a deficient number, since it is larger than the sum of its proper divisors (214283).

868021 is a wasteful number, since it uses less digits than its factorization.

868021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11291.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 868021 is about 931.6764459833. The cubic root of 868021 is about 95.3915877297.

Adding to 868021 its reverse (120868), we get a palindrome (988889).

The spelling of 868021 in words is "eight hundred sixty-eight thousand, twenty-one".