221854 has 4 divisors (see below), whose sum is σ = 332784. Its totient is φ = 110926.

The previous prime is 221849. The next prime is 221873. The reversal of 221854 is 458122.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

221854 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55462 + ... + 55465.

It is an arithmetic number, because the mean of its divisors is an integer number (83196).

2²²¹⁸⁵⁴ is an apocalyptic number.

221854 is a deficient number, since it is larger than the sum of its proper divisors (110930).

221854 is a wasteful number, since it uses less digits than its factorization.

221854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110929.

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

The square root of 221854 is about 471.0138002225. The cubic root of 221854 is about 60.5372127231.

Adding to 221854 its reverse (458122), we get a palindrome (679976).

The spelling of 221854 in words is "two hundred twenty-one thousand, eight hundred fifty-four".