11111222202161 has 2 divisors, whose sum is σ = 11111222202162. Its totient is φ = 11111222202160.

The previous prime is 11111222202107. The next prime is 11111222202193. The reversal of 11111222202161 is 16120222211111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6647404001536 + 4463818200625 = 2578256^2 + 2112775^2 .

It is an emirp because it is prime and its reverse (16120222211111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111222202161 - 2¹⁸ = 11111221940017 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111222202961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555611101080 + 5555611101081.

It is an arithmetic number, because the mean of its divisors is an integer number (5555611101081).

Almost surely, 2^{11111222202161} is an apocalyptic number.

It is an amenable number.

11111222202161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111222202161 is an equidigital number, since it uses as much as digits as its factorization.

11111222202161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 23.

Adding to 11111222202161 its reverse (16120222211111), we get a palindrome (27231444413272).

The spelling of 11111222202161 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-two million, two hundred two thousand, one hundred sixty-one".