211232321081 has 2 divisors, whose sum is σ = 211232321082. Its totient is φ = 211232321080.

The previous prime is 211232321059. The next prime is 211232321117. The reversal of 211232321081 is 180123232112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131998515856 + 79233805225 = 363316^2 + 281485^2 .

It is a cyclic number.

It is not a de Polignac number, because 211232321081 - 2⁶ = 211232321017 is a prime.

It is a super-2 number, since 2×211232321081² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211232321081.

It is not a weakly prime, because it can be changed into another prime (211232321021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105616160540 + 105616160541.

It is an arithmetic number, because the mean of its divisors is an integer number (105616160541).

Almost surely, 2^211232321081 is an apocalyptic number.

It is an amenable number.

211232321081 is a deficient number, since it is larger than the sum of its proper divisors (1).

211232321081 is an equidigital number, since it uses as much as digits as its factorization.

211232321081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 211232321081 its reverse (180123232112), we get a palindrome (391355553193).

The spelling of 211232321081 in words is "two hundred eleven billion, two hundred thirty-two million, three hundred twenty-one thousand, eighty-one".