201021310081 has 2 divisors, whose sum is σ = 201021310082. Its totient is φ = 201021310080.

The previous prime is 201021310051. The next prime is 201021310109. The reversal of 201021310081 is 180013120102.

201021310081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172769079025 + 28252231056 = 415655^2 + 168084^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021310081 - 2⁹ = 201021309569 is a prime.

It is a super-2 number, since 2×201021310081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201021310051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510655040 + 100510655041.

It is an arithmetic number, because the mean of its divisors is an integer number (100510655041).

Almost surely, 2^201021310081 is an apocalyptic number.

It is an amenable number.

201021310081 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021310081 is an equidigital number, since it uses as much as digits as its factorization.

201021310081 is an odious number, because the sum of its binary digits is odd.

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

Adding to 201021310081 its reverse (180013120102), we get a palindrome (381034430183).

The spelling of 201021310081 in words is "two hundred one billion, twenty-one million, three hundred ten thousand, eighty-one".