201112220161 has 2 divisors, whose sum is σ = 201112220162. Its totient is φ = 201112220160.

The previous prime is 201112220143. The next prime is 201112220173. The reversal of 201112220161 is 161022211102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154437210225 + 46675009936 = 392985^2 + 216044^2 .

It is a cyclic number.

It is not a de Polignac number, because 201112220161 - 2²⁵ = 201078665729 is a prime.

It is a super-2 number, since 2×201112220161² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201112220191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100556110080 + 100556110081.

It is an arithmetic number, because the mean of its divisors is an integer number (100556110081).

Almost surely, 2^201112220161 is an apocalyptic number.

It is an amenable number.

201112220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

201112220161 is an equidigital number, since it uses as much as digits as its factorization.

201112220161 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 201112220161 its reverse (161022211102), we get a palindrome (362134431263).

The spelling of 201112220161 in words is "two hundred one billion, one hundred twelve million, two hundred twenty thousand, one hundred sixty-one".