220021120002221 has 4 divisors (see below), whose sum is σ = 220021347224700. Its totient is φ = 220020892779744.

The previous prime is 220021120002217. The next prime is 220021120002227. The reversal of 220021120002221 is 122200021120022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54786806079721 + 165234313922500 = 7401811^2 + 12854350^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021120002221 - 2² = 220021120002217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220021120002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021120002227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112152536 + ... + 114097473.

It is an arithmetic number, because the mean of its divisors is an integer number (55005336806175).

Almost surely, 2^{220021120002221} is an apocalyptic number.

It is an amenable number.

220021120002221 is a deficient number, since it is larger than the sum of its proper divisors (227222479).

220021120002221 is an equidigital number, since it uses as much as digits as its factorization.

220021120002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227222478.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 220021120002221 its reverse (122200021120022), we get a palindrome (342221141122243).

The spelling of 220021120002221 in words is "two hundred twenty trillion, twenty-one billion, one hundred twenty million, two thousand, two hundred twenty-one".