220102221 has 4 divisors (see below), whose sum is σ = 293469632. Its totient is φ = 146734812.

The previous prime is 220102189. The next prime is 220102231. The reversal of 220102221 is 122201022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 220102221 - 2⁵ = 220102189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220102197 and 220102206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220102231) 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 3 ways as a sum of consecutive naturals, for example, 36683701 + ... + 36683706.

It is an arithmetic number, because the mean of its divisors is an integer number (73367408).

Almost surely, 2^220102221 is an apocalyptic number.

It is an amenable number.

220102221 is a deficient number, since it is larger than the sum of its proper divisors (73367411).

220102221 is an equidigital number, since it uses as much as digits as its factorization.

220102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73367410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 220102221 is about 14835.8424432184. The cubic root of 220102221 is about 603.7745575101.

Adding to 220102221 its reverse (122201022), we get a palindrome (342303243).

The spelling of 220102221 in words is "two hundred twenty million, one hundred two thousand, two hundred twenty-one".