221112120011161 has 2 divisors, whose sum is σ = 221112120011162. Its totient is φ = 221112120011160.

The previous prime is 221112120011143. The next prime is 221112120011269. The reversal of 221112120011161 is 161110021211122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158212247280025 + 62899872731136 = 12578245^2 + 7930944^2 .

It is a cyclic number.

It is not a de Polignac number, because 221112120011161 - 2¹¹ = 221112120009113 is a prime.

It is not a weakly prime, because it can be changed into another prime (221112123011161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110556060005580 + 110556060005581.

It is an arithmetic number, because the mean of its divisors is an integer number (110556060005581).

Almost surely, 2^{221112120011161} is an apocalyptic number.

It is an amenable number.

221112120011161 is a deficient number, since it is larger than the sum of its proper divisors (1).

221112120011161 is an equidigital number, since it uses as much as digits as its factorization.

221112120011161 is an odious number, because the sum of its binary digits is odd.

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

Adding to 221112120011161 its reverse (161110021211122), we get a palindrome (382222141222283).

The spelling of 221112120011161 in words is "two hundred twenty-one trillion, one hundred twelve billion, one hundred twenty million, eleven thousand, one hundred sixty-one".