221833 has 4 divisors (see below), whose sum is σ = 234900. Its totient is φ = 208768.

The previous prime is 221831. The next prime is 221849. The reversal of 221833 is 338122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150544 + 71289 = 388^2 + 267^2 .

It is a cyclic number.

It is not a de Polignac number, because 221833 - 2¹ = 221831 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 221833.

It is not an unprimeable number, because it can be changed into a prime (221831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6508 + ... + 6541.

It is an arithmetic number, because the mean of its divisors is an integer number (58725).

2²²¹⁸³³ is an apocalyptic number.

It is an amenable number.

221833 is a deficient number, since it is larger than the sum of its proper divisors (13067).

221833 is a wasteful number, since it uses less digits than its factorization.

221833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13066.

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

The square root of 221833 is about 470.9915073544. The cubic root of 221833 is about 60.5353025757.

Adding to 221833 its reverse (338122), we get a palindrome (559955).

The spelling of 221833 in words is "two hundred twenty-one thousand, eight hundred thirty-three".