2211221000221 has 4 divisors (see below), whose sum is σ = 2211255236700. Its totient is φ = 2211186763744.

The previous prime is 2211221000189. The next prime is 2211221000227. The reversal of 2211221000221 is 1220001221122.

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 2123181208996 + 88039791225 = 1457114^2 + 296715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211221000221 - 2⁵ = 2211221000189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211221000195 and 2211221000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211221000227) 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, 17021176 + ... + 17150593.

It is an arithmetic number, because the mean of its divisors is an integer number (552813809175).

Almost surely, 2^{2211221000221} is an apocalyptic number.

It is an amenable number.

2211221000221 is a deficient number, since it is larger than the sum of its proper divisors (34236479).

2211221000221 is an equidigital number, since it uses as much as digits as its factorization.

2211221000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34236478.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2211221000221 its reverse (1220001221122), we get a palindrome (3431222221343).

The spelling of 2211221000221 in words is "two trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.