220000221 has 96 divisors (see below), whose sum is σ = 408545280. Its totient is φ = 111196800.

The previous prime is 220000201. The next prime is 220000237. The reversal of 220000221 is 122000022.

It is not a de Polignac number, because 220000221 - 2⁵ = 220000189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220000201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1679326 + ... + 1679456.

It is an arithmetic number, because the mean of its divisors is an integer number (4255680).

Almost surely, 2^220000221 is an apocalyptic number.

220000221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220000221 is a deficient number, since it is larger than the sum of its proper divisors (188545059).

220000221 is a wasteful number, since it uses less digits than its factorization.

220000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 220000221 is about 14832.4044240979. The cubic root of 220000221 is about 603.6812758214.

Adding to 220000221 its reverse (122000022), we get a palindrome (342000243).

The spelling of 220000221 in words is "two hundred twenty million, two hundred twenty-one", and thus it is an aban number.