221022205 has 8 divisors (see below), whose sum is σ = 266760792. Its totient is φ = 175795008.

The previous prime is 221022199. The next prime is 221022209. The reversal of 221022205 is 502220122.

It can be written as a sum of positive squares in 4 ways, for example, as 86508601 + 134513604 = 9301^2 + 11598^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 221022205 - 2¹¹ = 221020157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126894 + ... + 128623.

It is an arithmetic number, because the mean of its divisors is an integer number (33345099).

Almost surely, 2^221022205 is an apocalyptic number.

It is an amenable number.

221022205 is a deficient number, since it is larger than the sum of its proper divisors (45738587).

221022205 is a wasteful number, since it uses less digits than its factorization.

221022205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255695.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 221022205 is about 14866.8155635294. The cubic root of 221022205 is about 604.6146078187.

Adding to 221022205 its reverse (502220122), we get a palindrome (723242327).

The spelling of 221022205 in words is "two hundred twenty-one million, twenty-two thousand, two hundred five".