221250 has 40 divisors (see below), whose sum is σ = 562320. Its totient is φ = 58000.

The previous prime is 221239. The next prime is 221251. The reversal of 221250 is 52122.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221250.

It is not an unprimeable number, because it can be changed into a prime (221251) by changing a digit.

221250 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3721 + ... + 3779.

It is an arithmetic number, because the mean of its divisors is an integer number (14058).

2²²¹²⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281160).

221250 is an abundant number, since it is smaller than the sum of its proper divisors (341070).

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

221250 is an equidigital number, since it uses as much as digits as its factorization.

221250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 221250 is about 470.3721930557. The cubic root of 221250 is about 60.4822250448.

Adding to 221250 its reverse (52122), we get a palindrome (273372).

The spelling of 221250 in words is "two hundred twenty-one thousand, two hundred fifty".