221155 has 8 divisors (see below), whose sum is σ = 289584. Its totient is φ = 160800.

The previous prime is 221101. The next prime is 221159. The reversal of 221155 is 551122.

221155 = T₁₉₅ + T₁₉₆ + ... + T₂₀₅.

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

It is a de Polignac number, because none of the positive numbers 2^k-221155 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (221159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1956 + ... + 2065.

It is an arithmetic number, because the mean of its divisors is an integer number (36198).

2²²¹¹⁵⁵ is an apocalyptic number.

221155 is a deficient number, since it is larger than the sum of its proper divisors (68429).

221155 is a wasteful number, since it uses less digits than its factorization.

221155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037.

The product of its digits is 100, while the sum is 16.

The square root of 221155 is about 470.2711983526. The cubic root of 221155 is about 60.4735672159.

Adding to 221155 its reverse (551122), we get a palindrome (772277).

The spelling of 221155 in words is "two hundred twenty-one thousand, one hundred fifty-five".