1001222220161 has 2 divisors, whose sum is σ = 1001222220162. Its totient is φ = 1001222220160.

The previous prime is 1001222220149. The next prime is 1001222220241. The reversal of 1001222220161 is 1610222221001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 959921819536 + 41300400625 = 979756^2 + 203225^2 .

It is an emirp because it is prime and its reverse (1610222221001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001222220161 - 2³⁰ = 1000148478337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001222520161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500611110080 + 500611110081.

It is an arithmetic number, because the mean of its divisors is an integer number (500611110081).

Almost surely, 2^{1001222220161} is an apocalyptic number.

It is an amenable number.

1001222220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001222220161 is an equidigital number, since it uses as much as digits as its factorization.

1001222220161 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 20.

Adding to 1001222220161 its reverse (1610222221001), we get a palindrome (2611444441162).

The spelling of 1001222220161 in words is "one trillion, one billion, two hundred twenty-two million, two hundred twenty thousand, one hundred sixty-one".