221164 has 6 divisors (see below), whose sum is σ = 387044. Its totient is φ = 110580.

The previous prime is 221159. The next prime is 221171. The reversal of 221164 is 461122.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 27642 + ... + 27649.

2²²¹¹⁶⁴ is an apocalyptic number.

It is an amenable number.

221164 is a deficient number, since it is larger than the sum of its proper divisors (165880).

221164 is a wasteful number, since it uses less digits than its factorization.

221164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55295 (or 55293 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 221164 is about 470.2807672019. The cubic root of 221164 is about 60.4743875376.

Adding to 221164 its reverse (461122), we get a palindrome (682286).

The spelling of 221164 in words is "two hundred twenty-one thousand, one hundred sixty-four".