285350021 has 16 divisors (see below), whose sum is σ = 319619520. Its totient is φ = 252510720.

The previous prime is 285350017. The next prime is 285350027. The reversal of 285350021 is 120053582.

It is not a de Polignac number, because 285350021 - 2² = 285350017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285350027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166115 + ... + 167823.

It is an arithmetic number, because the mean of its divisors is an integer number (19976220).

Almost surely, 2^285350021 is an apocalyptic number.

It is an amenable number.

285350021 is a deficient number, since it is larger than the sum of its proper divisors (34269499).

285350021 is a wasteful number, since it uses less digits than its factorization.

285350021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 285350021 is about 16892.3065624562. The cubic root of 285350021 is about 658.3537337622.

The spelling of 285350021 in words is "two hundred eighty-five million, three hundred fifty thousand, twenty-one".