1112221211161 has 2 divisors, whose sum is σ = 1112221211162. Its totient is φ = 1112221211160.

The previous prime is 1112221211083. The next prime is 1112221211173. The reversal of 1112221211161 is 1611121222111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 821662479936 + 290558731225 = 906456^2 + 539035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1112221211161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1112221211561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556110605580 + 556110605581.

It is an arithmetic number, because the mean of its divisors is an integer number (556110605581).

Almost surely, 2^{1112221211161} is an apocalyptic number.

It is an amenable number.

1112221211161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1112221211161 is an equidigital number, since it uses as much as digits as its factorization.

1112221211161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 22.

Adding to 1112221211161 its reverse (1611121222111), we get a palindrome (2723342433272).

The spelling of 1112221211161 in words is "one trillion, one hundred twelve billion, two hundred twenty-one million, two hundred eleven thousand, one hundred sixty-one".