221204 has 12 divisors (see below), whose sum is σ = 410004. Its totient is φ = 104064.

The previous prime is 221203. The next prime is 221209. The reversal of 221204 is 402122.

It can be written as a sum of positive squares in 2 ways, for example, as 204304 + 16900 = 452^2 + 130^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1559 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (34167).

2²²¹²⁰⁴ is an apocalyptic number.

It is an amenable number.

221204 is a deficient number, since it is larger than the sum of its proper divisors (188800).

221204 is a wasteful number, since it uses less digits than its factorization.

221204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3274 (or 3272 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 221204 is about 470.3232930655. The cubic root of 221204 is about 60.4780331425.

Adding to 221204 its reverse (402122), we get a palindrome (623326).

The spelling of 221204 in words is "two hundred twenty-one thousand, two hundred four", and thus it is an iban number.