10221220002221 has 4 divisors (see below), whose sum is σ = 10221237350844. Its totient is φ = 10221202653600.

The previous prime is 10221220002211. The next prime is 10221220002251. The reversal of 10221220002221 is 12220002212201.

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 2201703986596 + 8019516015625 = 1483814^2 + 2831875^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221220002221 - 2¹⁰ = 10221220001197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10221220002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221220002211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7758320 + ... + 8979641.

It is an arithmetic number, because the mean of its divisors is an integer number (2555309337711).

Almost surely, 2^{10221220002221} is an apocalyptic number.

It is an amenable number.

10221220002221 is a deficient number, since it is larger than the sum of its proper divisors (17348623).

10221220002221 is an equidigital number, since it uses as much as digits as its factorization.

10221220002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17348622.

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

Adding to 10221220002221 its reverse (12220002212201), we get a palindrome (22441222214422).

The spelling of 10221220002221 in words is "ten trillion, two hundred twenty-one billion, two hundred twenty million, two thousand, two hundred twenty-one".