10001221200221 has 2 divisors, whose sum is σ = 10001221200222. Its totient is φ = 10001221200220.

The previous prime is 10001221200143. The next prime is 10001221200281. The reversal of 10001221200221 is 12200212210001.

10001221200221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9510198667321 + 491022532900 = 3083861^2 + 700730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10001221200221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10001221200196 and 10001221200205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10001221200281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000610600110 + 5000610600111.

It is an arithmetic number, because the mean of its divisors is an integer number (5000610600111).

Almost surely, 2^{10001221200221} is an apocalyptic number.

It is an amenable number.

10001221200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001221200221 is an equidigital number, since it uses as much as digits as its factorization.

10001221200221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10001221200221 its reverse (12200212210001), we get a palindrome (22201433410222).

The spelling of 10001221200221 in words is "ten trillion, one billion, two hundred twenty-one million, two hundred thousand, two hundred twenty-one".