221022 has 16 divisors (see below), whose sum is σ = 491280. Its totient is φ = 73656.

The previous prime is 221021. The next prime is 221047. The reversal of 221022 is 220122.

221022 is nontrivially palindromic in base 5.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 220995 and 221013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1993 + ... + 2100.

It is an arithmetic number, because the mean of its divisors is an integer number (30705).

2²²¹⁰²² is an apocalyptic number.

221022 is an abundant number, since it is smaller than the sum of its proper divisors (270258).

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

221022 is a wasteful number, since it uses less digits than its factorization.

221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 221022 is about 470.1297693191. The cubic root of 221022 is about 60.4614420890.

Adding to 221022 its reverse (220122), we get a palindrome (441144).

Subtracting from 221022 its reverse (220122), we obtain a square (900 = 30²).

The spelling of 221022 in words is "two hundred twenty-one thousand, twenty-two", and thus it is an iban number.