221036205 has 16 divisors (see below), whose sum is σ = 380862720. Its totient is φ = 108817728.

The previous prime is 221036203. The next prime is 221036209. The reversal of 221036205 is 502630122.

It is not a de Polignac number, because 221036205 - 2¹ = 221036203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221036201) 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 15 ways as a sum of consecutive naturals, for example, 566565 + ... + 566954.

It is an arithmetic number, because the mean of its divisors is an integer number (23803920).

Almost surely, 2^221036205 is an apocalyptic number.

It is an amenable number.

221036205 is a deficient number, since it is larger than the sum of its proper divisors (159826515).

221036205 is a wasteful number, since it uses less digits than its factorization.

221036205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133540.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221036205 is about 14867.2864033757. The cubic root of 221036205 is about 604.6273733925.

Adding to 221036205 its reverse (502630122), we get a palindrome (723666327).

The spelling of 221036205 in words is "two hundred twenty-one million, thirty-six thousand, two hundred five".