221910 has 32 divisors (see below), whose sum is σ = 574560. Its totient is φ = 54528.

The previous prime is 221909. The next prime is 221941. The reversal of 221910 is 19122.

It is a happy number.

221910 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221910.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106 + ... + 674.

It is an arithmetic number, because the mean of its divisors is an integer number (17955).

2²²¹⁹¹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287280).

221910 is an abundant number, since it is smaller than the sum of its proper divisors (352650).

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

221910 is a wasteful number, since it uses less digits than its factorization.

221910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 221910 is about 471.0732427129. The cubic root of 221910 is about 60.5423058605.

It can be divided in two parts, 2 and 21910, that added together give a palindrome (21912).

The spelling of 221910 in words is "two hundred twenty-one thousand, nine hundred ten".