221822 has 8 divisors (see below), whose sum is σ = 335016. Its totient is φ = 110152.

The previous prime is 221813. The next prime is 221827. The reversal of 221822 is 228122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221827) by changing a digit.

221822 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 675.

It is an arithmetic number, because the mean of its divisors is an integer number (41877).

2²²¹⁸²² is an apocalyptic number.

221822 is a deficient number, since it is larger than the sum of its proper divisors (113194).

221822 is a wasteful number, since it uses less digits than its factorization.

221822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762.

The product of its digits is 128, while the sum is 17.

The square root of 221822 is about 470.9798297167. The cubic root of 221822 is about 60.5343019741.

Adding to 221822 its reverse (228122), we get a palindrome (449944).

The spelling of 221822 in words is "two hundred twenty-one thousand, eight hundred twenty-two".