221125 has 16 divisors (see below), whose sum is σ = 290160. Its totient is φ = 168000.

The previous prime is 221101. The next prime is 221159. The reversal of 221125 is 521122.

It can be written as a sum of positive squares in 8 ways, for example, as 134689 + 86436 = 367^2 + 294^2 .

It is not a de Polignac number, because 221125 - 2⁵ = 221093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3595 + ... + 3655.

It is an arithmetic number, because the mean of its divisors is an integer number (18135).

2²²¹¹²⁵ is an apocalyptic number.

221125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221125 is a deficient number, since it is larger than the sum of its proper divisors (69035).

221125 is an equidigital number, since it uses as much as digits as its factorization.

221125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 95 counting only the distinct ones).

The product of its digits is 40, while the sum is 13.

The square root of 221125 is about 470.2393007821. The cubic root of 221125 is about 60.4708326495.

Adding to 221125 its reverse (521122), we get a palindrome (742247).

The spelling of 221125 in words is "two hundred twenty-one thousand, one hundred twenty-five".