221662 has 16 divisors (see below), whose sum is σ = 387072. Its totient is φ = 93240.

The previous prime is 221659. The next prime is 221671. The reversal of 221662 is 266122.

It is a congruent number.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 883 + ... + 1105.

It is an arithmetic number, because the mean of its divisors is an integer number (24192).

2²²¹⁶⁶² is an apocalyptic number.

221662 is a deficient number, since it is larger than the sum of its proper divisors (165410).

221662 is a wasteful number, since it uses less digits than its factorization.

221662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303.

The product of its digits is 288, while the sum is 19.

The square root of 221662 is about 470.8099404218. The cubic root of 221662 is about 60.5197440283.

Adding to 221662 its reverse (266122), we get a palindrome (487784).

It can be divided in two parts, 2216 and 62, that added together give a triangular number (2278 = T₆₇).

The spelling of 221662 in words is "two hundred twenty-one thousand, six hundred sixty-two".