221000105 has 4 divisors (see below), whose sum is σ = 265200132. Its totient is φ = 176800080.

The previous prime is 221000071. The next prime is 221000107. The reversal of 221000105 is 501000122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51036736 + 169963369 = 7144^2 + 13037^2 .

It is not a de Polignac number, because 221000105 - 2¹⁰ = 220999081 is a prime.

It is a super-2 number, since 2×221000105² = 97682092820022050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000107) 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 3 ways as a sum of consecutive naturals, for example, 22100006 + ... + 22100015.

It is an arithmetic number, because the mean of its divisors is an integer number (66300033).

Almost surely, 2^221000105 is an apocalyptic number.

It is an amenable number.

221000105 is a deficient number, since it is larger than the sum of its proper divisors (44200027).

221000105 is an equidigital number, since it uses as much as digits as its factorization.

221000105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44200026.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 221000105 is about 14866.0722788503. The cubic root of 221000105 is about 604.5944553515.

Adding to 221000105 its reverse (501000122), we get a palindrome (722000227).

The spelling of 221000105 in words is "two hundred twenty-one million, one hundred five", and thus it is an aban number.