221834 has 4 divisors (see below), whose sum is σ = 332754. Its totient is φ = 110916.

The previous prime is 221831. The next prime is 221849. The reversal of 221834 is 438122.

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

It can be written as a sum of positive squares in only one way, i.e., 180625 + 41209 = 425^2 + 203^2 .

It is an Ulam number.

It is a plaindrome in base 15.

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 as a sum of consecutive naturals, namely, 55457 + ... + 55460.

2²²¹⁸³⁴ is an apocalyptic number.

221834 is a deficient number, since it is larger than the sum of its proper divisors (110920).

221834 is a wasteful number, since it uses less digits than its factorization.

221834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110919.

The product of its digits is 384, while the sum is 20.

The square root of 221834 is about 470.9925689435. The cubic root of 221834 is about 60.5353935378.

Adding to 221834 its reverse (438122), we get a palindrome (659956).

The spelling of 221834 in words is "two hundred twenty-one thousand, eight hundred thirty-four".