201212122081 has 2 divisors, whose sum is σ = 201212122082. Its totient is φ = 201212122080.

The previous prime is 201212122037. The next prime is 201212122141. The reversal of 201212122081 is 180221212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106874071056 + 94338051025 = 326916^2 + 307145^2 .

It is a cyclic number.

It is not a de Polignac number, because 201212122081 - 2¹⁷ = 201211991009 is a prime.

It is a super-2 number, since 2×201212122081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201212123081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100606061040 + 100606061041.

It is an arithmetic number, because the mean of its divisors is an integer number (100606061041).

Almost surely, 2^201212122081 is an apocalyptic number.

It is an amenable number.

201212122081 is a deficient number, since it is larger than the sum of its proper divisors (1).

201212122081 is an equidigital number, since it uses as much as digits as its factorization.

201212122081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 201212122081 its reverse (180221212102), we get a palindrome (381433334183).

The spelling of 201212122081 in words is "two hundred one billion, two hundred twelve million, one hundred twenty-two thousand, eighty-one".