211123022081 has 2 divisors, whose sum is σ = 211123022082. Its totient is φ = 211123022080.

The previous prime is 211123022063. The next prime is 211123022087. The reversal of 211123022081 is 180220321112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106266220225 + 104856801856 = 325985^2 + 323816^2 .

It is a cyclic number.

It is not a de Polignac number, because 211123022081 - 2¹⁸ = 211122759937 is a prime.

It is a super-2 number, since 2×211123022081² (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 (211123022087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561511040 + 105561511041.

It is an arithmetic number, because the mean of its divisors is an integer number (105561511041).

Almost surely, 2^211123022081 is an apocalyptic number.

It is an amenable number.

211123022081 is a deficient number, since it is larger than the sum of its proper divisors (1).

211123022081 is an equidigital number, since it uses as much as digits as its factorization.

211123022081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 211123022081 its reverse (180220321112), we get a palindrome (391343343193).

The spelling of 211123022081 in words is "two hundred eleven billion, one hundred twenty-three million, twenty-two thousand, eighty-one".