221875 has 12 divisors (see below), whose sum is σ = 281232. Its totient is φ = 175000.

The previous prime is 221873. The next prime is 221891. The reversal of 221875 is 578122.

It is not a de Polignac number, because 221875 - 2¹ = 221873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a nialpdrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (221873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3090 + ... + 3160.

It is an arithmetic number, because the mean of its divisors is an integer number (23436).

221875 is a Friedman number, since it can be written as 71*((8+2)/2)^5, using all its digits and the basic arithmetic operations.

2²²¹⁸⁷⁵ is an apocalyptic number.

221875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221875 is a deficient number, since it is larger than the sum of its proper divisors (59357).

221875 is an frugal number, since it uses more digits than its factorization.

221875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 76 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 221875 is about 471.0360920354. The cubic root of 221875 is about 60.5391227501.

Adding to 221875 its reverse (578122), we get a palindrome (799997).

The spelling of 221875 in words is "two hundred twenty-one thousand, eight hundred seventy-five".