221485 has 8 divisors (see below), whose sum is σ = 290016. Its totient is φ = 161040.

The previous prime is 221477. The next prime is 221489. The reversal of 221485 is 584122.

221485 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221485 - 2³ = 221477 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221489) 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, 1959 + ... + 2068.

It is an arithmetic number, because the mean of its divisors is an integer number (36252).

2²²¹⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

221485 is a deficient number, since it is larger than the sum of its proper divisors (68531).

221485 is a wasteful number, since it uses less digits than its factorization.

221485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4043.

The product of its digits is 640, while the sum is 22.

The square root of 221485 is about 470.6219289408. The cubic root of 221485 is about 60.5036311369.

The spelling of 221485 in words is "two hundred twenty-one thousand, four hundred eighty-five".