11101211220221 has 2 divisors, whose sum is σ = 11101211220222. Its totient is φ = 11101211220220.

The previous prime is 11101211220199. The next prime is 11101211220247. The reversal of 11101211220221 is 12202211210111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10985280504025 + 115930716196 = 3314405^2 + 340486^2 .

It is a cyclic number.

It is not a de Polignac number, because 11101211220221 - 2¹⁴ = 11101211203837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11101211220221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11101211220721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550605610110 + 5550605610111.

It is an arithmetic number, because the mean of its divisors is an integer number (5550605610111).

Almost surely, 2^{11101211220221} is an apocalyptic number.

It is an amenable number.

11101211220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101211220221 is an equidigital number, since it uses as much as digits as its factorization.

11101211220221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11101211220221 its reverse (12202211210111), we get a palindrome (23303422430332).

The spelling of 11101211220221 in words is "eleven trillion, one hundred one billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty-one".