221748 has 24 divisors (see below), whose sum is σ = 548352. Its totient is φ = 69504.

The previous prime is 221747. The next prime is 221773. The reversal of 221748 is 847122.

221748 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 not an unprimeable number, because it can be changed into a prime (221747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340 + ... + 747.

It is an arithmetic number, because the mean of its divisors is an integer number (22848).

2²²¹⁷⁴⁸ is an apocalyptic number.

It is an amenable number.

221748 is an abundant number, since it is smaller than the sum of its proper divisors (326604).

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

221748 is a wasteful number, since it uses less digits than its factorization.

221748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1109 counting only the distinct ones).

The product of its digits is 896, while the sum is 24.

The square root of 221748 is about 470.9012635362. The cubic root of 221748 is about 60.5275697946.

It can be divided in two parts, 221 and 748, that added together give a palindrome (969).

The spelling of 221748 in words is "two hundred twenty-one thousand, seven hundred forty-eight".