221862 has 16 divisors (see below), whose sum is σ = 449280. Its totient is φ = 73032.

The previous prime is 221849. The next prime is 221873. The reversal of 221862 is 268122.

221862 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

221862 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439 + ... + 797.

It is an arithmetic number, because the mean of its divisors is an integer number (28080).

2²²¹⁸⁶² is an apocalyptic number.

221862 is an abundant number, since it is smaller than the sum of its proper divisors (227418).

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

221862 is a wasteful number, since it uses less digits than its factorization.

221862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467.

The product of its digits is 384, while the sum is 21.

The square root of 221862 is about 471.0222924661. The cubic root of 221862 is about 60.5379403667.

Subtracting from 221862 its sum of digits (21), we obtain a square (221841 = 471²).

Adding to 221862 its reverse (268122), we get a palindrome (489984).

The spelling of 221862 in words is "two hundred twenty-one thousand, eight hundred sixty-two".