285021 has 12 divisors (see below), whose sum is σ = 449280. Its totient is φ = 172680.

The previous prime is 285007. The next prime is 285023. The reversal of 285021 is 120582.

It is not a de Polignac number, because 285021 - 2⁵ = 284989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 284985 and 285003.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285021.

It is not an unprimeable number, because it can be changed into a prime (285023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1341 + ... + 1538.

It is an arithmetic number, because the mean of its divisors is an integer number (37440).

2²⁸⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

285021 is a deficient number, since it is larger than the sum of its proper divisors (164259).

285021 is a wasteful number, since it uses less digits than its factorization.

285021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896 (or 2893 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 285021 is about 533.8735805413. The cubic root of 285021 is about 65.8100599605.

The spelling of 285021 in words is "two hundred eighty-five thousand, twenty-one".