221020020110161 has 2 divisors, whose sum is σ = 221020020110162. Its totient is φ = 221020020110160.

The previous prime is 221020020110083. The next prime is 221020020110173. The reversal of 221020020110161 is 161011020020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188880191470161 + 32139828640000 = 13743369^2 + 5669200^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020020110161 - 2²⁵ = 221019986555729 is a prime.

It is not a weakly prime, because it can be changed into another prime (221020020110861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510010055080 + 110510010055081.

It is an arithmetic number, because the mean of its divisors is an integer number (110510010055081).

Almost surely, 2^{221020020110161} is an apocalyptic number.

It is an amenable number.

221020020110161 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020020110161 is an equidigital number, since it uses as much as digits as its factorization.

221020020110161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 221020020110161 its reverse (161011020020122), we get a palindrome (382031040130283).

The spelling of 221020020110161 in words is "two hundred twenty-one trillion, twenty billion, twenty million, one hundred ten thousand, one hundred sixty-one".