221100164 has 12 divisors (see below), whose sum is σ = 409685724. Its totient is φ = 104047104.

The previous prime is 221100161. The next prime is 221100193. The reversal of 221100164 is 461001122.

It can be written as a sum of positive squares in 2 ways, for example, as 71233600 + 149866564 = 8440^2 + 12242^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (221100161) 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, 1625669 + ... + 1625804.

It is an arithmetic number, because the mean of its divisors is an integer number (34140477).

Almost surely, 2^221100164 is an apocalyptic number.

It is an amenable number.

221100164 is a deficient number, since it is larger than the sum of its proper divisors (188585560).

221100164 is a wasteful number, since it uses less digits than its factorization.

221100164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251494 (or 3251492 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 221100164 is about 14869.4372455719. The cubic root of 221100164 is about 604.6856860609.

Adding to 221100164 its reverse (461001122), we get a palindrome (682101286).

The spelling of 221100164 in words is "two hundred twenty-one million, one hundred thousand, one hundred sixty-four".