284221 has 8 divisors (see below), whose sum is σ = 342080. Its totient is φ = 230688.

The previous prime is 284201. The next prime is 284227. The reversal of 284221 is 122482.

284221 = T₇₀ + T₇₁ + ... + T₁₂₆.

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 284221 - 2⁷ = 284093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936 + ... + 1201.

It is an arithmetic number, because the mean of its divisors is an integer number (42760).

2²⁸⁴²²¹ is an apocalyptic number.

It is an amenable number.

284221 is a deficient number, since it is larger than the sum of its proper divisors (57859).

284221 is a wasteful number, since it uses less digits than its factorization.

284221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163.

The product of its digits is 256, while the sum is 19.

The square root of 284221 is about 533.1238130116. The cubic root of 284221 is about 65.7484301360.

It can be divided in two parts, 284 and 221, that added together give a palindrome (505).

The spelling of 284221 in words is "two hundred eighty-four thousand, two hundred twenty-one".