201220112081 has 2 divisors, whose sum is σ = 201220112082. Its totient is φ = 201220112080.

The previous prime is 201220112069. The next prime is 201220112147. The reversal of 201220112081 is 180211022102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173090113681 + 28129998400 = 416041^2 + 167720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201220112081 is a prime.

It is a super-2 number, since 2×201220112081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201220112381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610056040 + 100610056041.

It is an arithmetic number, because the mean of its divisors is an integer number (100610056041).

Almost surely, 2^201220112081 is an apocalyptic number.

It is an amenable number.

201220112081 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220112081 is an equidigital number, since it uses as much as digits as its factorization.

201220112081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 201220112081 its reverse (180211022102), we get a palindrome (381431134183).

The spelling of 201220112081 in words is "two hundred one billion, two hundred twenty million, one hundred twelve thousand, eighty-one".