211231321061 has 2 divisors, whose sum is σ = 211231321062. Its totient is φ = 211231321060.

The previous prime is 211231321043. The next prime is 211231321129. The reversal of 211231321061 is 160123132112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179707318561 + 31524002500 = 423919^2 + 177550^2 .

It is a cyclic number.

It is not a de Polignac number, because 211231321061 - 2⁶ = 211231320997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211231324061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615660530 + 105615660531.

It is an arithmetic number, because the mean of its divisors is an integer number (105615660531).

Almost surely, 2^211231321061 is an apocalyptic number.

It is an amenable number.

211231321061 is a deficient number, since it is larger than the sum of its proper divisors (1).

211231321061 is an equidigital number, since it uses as much as digits as its factorization.

211231321061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 211231321061 its reverse (160123132112), we get a palindrome (371354453173).

The spelling of 211231321061 in words is "two hundred eleven billion, two hundred thirty-one million, three hundred twenty-one thousand, sixty-one".