221089 has 8 divisors (see below), whose sum is σ = 244800. Its totient is φ = 198000.

The previous prime is 221087. The next prime is 221093. The reversal of 221089 is 980122.

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

It is not a de Polignac number, because 221089 - 2¹ = 221087 is a prime.

It is a Duffinian number.

221089 is a modest number, since divided by 1089 gives 22 as remainder.

221089 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (221083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012 + ... + 1210.

It is an arithmetic number, because the mean of its divisors is an integer number (30600).

2²²¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

221089 is a deficient number, since it is larger than the sum of its proper divisors (23711).

221089 is a wasteful number, since it uses less digits than its factorization.

221089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 221089 is about 470.2010208411. The cubic root of 221089 is about 60.4675508434.

It can be divided in two parts, 22 and 1089, that added together give a palindrome (1111).

The spelling of 221089 in words is "two hundred twenty-one thousand, eighty-nine".