221534 has 8 divisors (see below), whose sum is σ = 334368. Its totient is φ = 110080.

The previous prime is 221509. The next prime is 221537. The reversal of 221534 is 435122.

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

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221537) 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, 299 + ... + 729.

It is an arithmetic number, because the mean of its divisors is an integer number (41796).

2²²¹⁵³⁴ is an apocalyptic number.

221534 is a deficient number, since it is larger than the sum of its proper divisors (112834).

221534 is a wasteful number, since it uses less digits than its factorization.

221534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its digits is 240, while the sum is 17.

The square root of 221534 is about 470.6739848345. The cubic root of 221534 is about 60.5080926269.

Adding to 221534 its reverse (435122), we get a palindrome (656656).

The spelling of 221534 in words is "two hundred twenty-one thousand, five hundred thirty-four".