221560 has 32 divisors (see below), whose sum is σ = 518400. Its totient is φ = 85120.

The previous prime is 221549. The next prime is 221567. The reversal of 221560 is 65122.

It is a happy number.

221560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221567) 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, 1065 + ... + 1255.

It is an arithmetic number, because the mean of its divisors is an integer number (16200).

2²²¹⁵⁶⁰ is an apocalyptic number.

221560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259200).

221560 is an abundant number, since it is smaller than the sum of its proper divisors (296840).

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

221560 is a wasteful number, since it uses less digits than its factorization.

221560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 221560 is about 470.7016039913. The cubic root of 221560 is about 60.5104596810.

Adding to 221560 its reverse (65122), we get a palindrome (286682).

The spelling of 221560 in words is "two hundred twenty-one thousand, five hundred sixty".