212112110081 has 2 divisors, whose sum is σ = 212112110082. Its totient is φ = 212112110080.

The previous prime is 212112110051. The next prime is 212112110137. The reversal of 212112110081 is 180011211212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193768116481 + 18343993600 = 440191^2 + 135440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212112110081 is a prime.

It is a super-2 number, since 2×212112110081² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212112110011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106056055040 + 106056055041.

It is an arithmetic number, because the mean of its divisors is an integer number (106056055041).

Almost surely, 2^212112110081 is an apocalyptic number.

It is an amenable number.

212112110081 is a deficient number, since it is larger than the sum of its proper divisors (1).

212112110081 is an equidigital number, since it uses as much as digits as its factorization.

212112110081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 212112110081 its reverse (180011211212), we get a palindrome (392123321293).

The spelling of 212112110081 in words is "two hundred twelve billion, one hundred twelve million, one hundred ten thousand, eighty-one".