221124 has 12 divisors (see below), whose sum is σ = 515984. Its totient is φ = 73704.

The previous prime is 221101. The next prime is 221159. The reversal of 221124 is 421122.

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

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 18427 = 221124 / (2 + 2 + 1 + 1 + 2 + 4).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

221124 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9202 + ... + 9225.

2²²¹¹²⁴ is an apocalyptic number.

It is an amenable number.

221124 is an abundant number, since it is smaller than the sum of its proper divisors (294860).

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

221124 is a wasteful number, since it uses less digits than its factorization.

221124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18434 (or 18432 counting only the distinct ones).

The product of its digits is 32, while the sum is 12.

The square root of 221124 is about 470.2382374924. The cubic root of 221124 is about 60.4707414931.

Adding to 221124 its reverse (421122), we get a palindrome (642246).

The spelling of 221124 in words is "two hundred twenty-one thousand, one hundred twenty-four", and thus it is an iban number.