221100120161 has 2 divisors, whose sum is σ = 221100120162. Its totient is φ = 221100120160.

The previous prime is 221100120149. The next prime is 221100120167. The reversal of 221100120161 is 161021001122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154700622400 + 66399497761 = 393320^2 + 257681^2 .

It is a cyclic number.

It is not a de Polignac number, because 221100120161 - 2⁶ = 221100120097 is a prime.

It is not a weakly prime, because it can be changed into another prime (221100120167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550060080 + 110550060081.

It is an arithmetic number, because the mean of its divisors is an integer number (110550060081).

Almost surely, 2^221100120161 is an apocalyptic number.

It is an amenable number.

221100120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

221100120161 is an equidigital number, since it uses as much as digits as its factorization.

221100120161 is an odious number, because the sum of its binary digits is odd.

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

Adding to 221100120161 its reverse (161021001122), we get a palindrome (382121121283).

The spelling of 221100120161 in words is "two hundred twenty-one billion, one hundred million, one hundred twenty thousand, one hundred sixty-one".