210211081 has 2 divisors, whose sum is σ = 210211082. Its totient is φ = 210211080.

The previous prime is 210211061. The next prime is 210211109. The reversal of 210211081 is 180112012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198246400 + 11964681 = 14080^2 + 3459^2 .

It is a cyclic number.

It is not a de Polignac number, because 210211081 - 2⁷ = 210210953 is a prime.

It is a super-3 number, since 3×210211081³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (210211061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105540 + 105105541.

It is an arithmetic number, because the mean of its divisors is an integer number (105105541).

Almost surely, 2^210211081 is an apocalyptic number.

It is an amenable number.

210211081 is a deficient number, since it is larger than the sum of its proper divisors (1).

210211081 is an equidigital number, since it uses as much as digits as its factorization.

210211081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 210211081 is about 14498.6579034061. The cubic root of 210211081 is about 594.5912792216.

Adding to 210211081 its reverse (180112012), we get a palindrome (390323093).

The spelling of 210211081 in words is "two hundred ten million, two hundred eleven thousand, eighty-one".