221884 has 24 divisors (see below), whose sum is σ = 444528. Its totient is φ = 96000.

The previous prime is 221873. The next prime is 221891. The reversal of 221884 is 488122.

221884 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759 + ... + 1009.

It is an arithmetic number, because the mean of its divisors is an integer number (18522).

2²²¹⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

221884 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221884 is a wasteful number, since it uses less digits than its factorization.

221884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 283 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 221884 is about 471.0456453466. The cubic root of 221884 is about 60.5399412962.

It can be divided in two parts, 221 and 884, that multiplied together give a square (195364 = 442²).

The spelling of 221884 in words is "two hundred twenty-one thousand, eight hundred eighty-four".