221744 has 10 divisors (see below), whose sum is σ = 429660. Its totient is φ = 110864.

The previous prime is 221737. The next prime is 221747. The reversal of 221744 is 447122.

221744 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6914 + ... + 6945.

It is an arithmetic number, because the mean of its divisors is an integer number (42966).

2²²¹⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

221744 is a deficient number, since it is larger than the sum of its proper divisors (207916).

221744 is a wasteful number, since it uses less digits than its factorization.

221744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13867 (or 13861 counting only the distinct ones).

The product of its digits is 448, while the sum is 20.

The square root of 221744 is about 470.8970163422. The cubic root of 221744 is about 60.5272058503.

Adding to 221744 its reverse (447122), we get a palindrome (668866).

The spelling of 221744 in words is "two hundred twenty-one thousand, seven hundred forty-four", and thus it is an iban number.