2181223 has 8 divisors (see below), whose sum is σ = 2430720. Its totient is φ = 1940280.

The previous prime is 2181217. The next prime is 2181227. The reversal of 2181223 is 3221812.

2181223 = 192² + 193² + ... + 238².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2181223 is a prime.

It is a Duffinian number.

2181223 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2181223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1593 + ... + 2626.

It is an arithmetic number, because the mean of its divisors is an integer number (303840).

2^2181223 is an apocalyptic number.

2181223 is a deficient number, since it is larger than the sum of its proper divisors (249497).

2181223 is a wasteful number, since it uses less digits than its factorization.

2181223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4277.

The product of its digits is 192, while the sum is 19.

The square root of 2181223 is about 1476.8964080124. The cubic root of 2181223 is about 129.6880686964.

It can be divided in two parts, 218 and 1223, that added together give a palindrome (1441).

The spelling of 2181223 in words is "two million, one hundred eighty-one thousand, two hundred twenty-three".