211331342281 has 2 divisors, whose sum is σ = 211331342282. Its totient is φ = 211331342280.

The previous prime is 211331342251. The next prime is 211331342317. The reversal of 211331342281 is 182243133112.

211331342281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208597725625 + 2733616656 = 456725^2 + 52284^2 .

It is a cyclic number.

It is not a de Polignac number, because 211331342281 - 2⁷ = 211331342153 is a prime.

It is a super-2 number, since 2×211331342281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211331342251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105665671140 + 105665671141.

It is an arithmetic number, because the mean of its divisors is an integer number (105665671141).

Almost surely, 2^211331342281 is an apocalyptic number.

It is an amenable number.

211331342281 is a deficient number, since it is larger than the sum of its proper divisors (1).

211331342281 is an equidigital number, since it uses as much as digits as its factorization.

211331342281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

Adding to 211331342281 its reverse (182243133112), we get a palindrome (393574475393).

The spelling of 211331342281 in words is "two hundred eleven billion, three hundred thirty-one million, three hundred forty-two thousand, two hundred eighty-one".