221484 has 12 divisors (see below), whose sum is σ = 516824. Its totient is φ = 73824.

The previous prime is 221477. The next prime is 221489. The reversal of 221484 is 484122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 221484.

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 3 ways as a sum of consecutive naturals, for example, 9217 + ... + 9240.

2²²¹⁴⁸⁴ is an apocalyptic number.

It is an amenable number.

221484 is an abundant number, since it is smaller than the sum of its proper divisors (295340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221484 is a wasteful number, since it uses less digits than its factorization.

221484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18464 (or 18462 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

The square root of 221484 is about 470.6208665157. The cubic root of 221484 is about 60.5035400793.

The spelling of 221484 in words is "two hundred twenty-one thousand, four hundred eighty-four".