11021217161 has 2 divisors, whose sum is σ = 11021217162. Its totient is φ = 11021217160.

The previous prime is 11021217131. The next prime is 11021217173. The reversal of 11021217161 is 16171212011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10698799225 + 322417936 = 103435^2 + 17956^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021217161 - 2¹⁰ = 11021216137 is a prime.

It is not a weakly prime, because it can be changed into another prime (11021217131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510608580 + 5510608581.

It is an arithmetic number, because the mean of its divisors is an integer number (5510608581).

Almost surely, 2^11021217161 is an apocalyptic number.

It is an amenable number.

11021217161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021217161 is an equidigital number, since it uses as much as digits as its factorization.

11021217161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 23.

Adding to 11021217161 its reverse (16171212011), we get a palindrome (27192429172).

The spelling of 11021217161 in words is "eleven billion, twenty-one million, two hundred seventeen thousand, one hundred sixty-one".