221140221 has 32 divisors (see below), whose sum is σ = 320993280. Its totient is φ = 134971200.

The previous prime is 221140187. The next prime is 221140223. The reversal of 221140221 is 122041122.

It is not a de Polignac number, because 221140221 - 2⁷ = 221140093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221140221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221140223) 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 31 ways as a sum of consecutive naturals, for example, 213976 + ... + 215006.

It is an arithmetic number, because the mean of its divisors is an integer number (10031040).

Almost surely, 2^221140221 is an apocalyptic number.

It is an amenable number.

221140221 is a deficient number, since it is larger than the sum of its proper divisors (99853059).

221140221 is a wasteful number, since it uses less digits than its factorization.

221140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 221140221 is about 14870.7841420686. The cubic root of 221140221 is about 604.7222010826.

Adding to 221140221 its reverse (122041122), we get a palindrome (343181343).

Subtracting from 221140221 its reverse (122041122), we obtain a palindrome (99099099).

The spelling of 221140221 in words is "two hundred twenty-one million, one hundred forty thousand, two hundred twenty-one".