11012220161 has 2 divisors, whose sum is σ = 11012220162. Its totient is φ = 11012220160.

The previous prime is 11012220143. The next prime is 11012220211. The reversal of 11012220161 is 16102221011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7472565136 + 3539655025 = 86444^2 + 59495^2 .

It is an emirp because it is prime and its reverse (16102221011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11012220161 - 2¹⁴ = 11012203777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11012222161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5506110080 + 5506110081.

It is an arithmetic number, because the mean of its divisors is an integer number (5506110081).

Almost surely, 2^11012220161 is an apocalyptic number.

It is an amenable number.

11012220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11012220161 is an equidigital number, since it uses as much as digits as its factorization.

11012220161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 11012220161 its reverse (16102221011), we get a palindrome (27114441172).

The spelling of 11012220161 in words is "eleven billion, twelve million, two hundred twenty thousand, one hundred sixty-one".