220101000221 has 2 divisors, whose sum is σ = 220101000222. Its totient is φ = 220101000220.

The previous prime is 220101000209. The next prime is 220101000247. The reversal of 220101000221 is 122000101022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125042860996 + 95058139225 = 353614^2 + 308315^2 .

It is a cyclic number.

It is not a de Polignac number, because 220101000221 - 2³⁴ = 202921131037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220101000121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110050500110 + 110050500111.

It is an arithmetic number, because the mean of its divisors is an integer number (110050500111).

Almost surely, 2^220101000221 is an apocalyptic number.

It is an amenable number.

220101000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220101000221 is an equidigital number, since it uses as much as digits as its factorization.

220101000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 220101000221 its reverse (122000101022), we get a palindrome (342101101243).

The spelling of 220101000221 in words is "two hundred twenty billion, one hundred one million, two hundred twenty-one", and thus it is an aban number.