221055 has 8 divisors (see below), whose sum is σ = 353712. Its totient is φ = 117888.

The previous prime is 221047. The next prime is 221059. The reversal of 221055 is 550122.

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

It is not a de Polignac number, because 221055 - 2³ = 221047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 14737 = 221055 / (2 + 2 + 1 + 0 + 5 + 5).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221059) 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, 7354 + ... + 7383.

It is an arithmetic number, because the mean of its divisors is an integer number (44214).

2²²¹⁰⁵⁵ is an apocalyptic number.

221055 is a deficient number, since it is larger than the sum of its proper divisors (132657).

221055 is a wasteful number, since it uses less digits than its factorization.

221055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14745.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 221055 is about 470.1648647017. The cubic root of 221055 is about 60.4644510328.

Adding to 221055 its reverse (550122), we get a palindrome (771177).

The spelling of 221055 in words is "two hundred twenty-one thousand, fifty-five".