210010081 has 2 divisors, whose sum is σ = 210010082. Its totient is φ = 210010080.

The previous prime is 210010069. The next prime is 210010091. The reversal of 210010081 is 180010012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170067681 + 39942400 = 13041^2 + 6320^2 .

It is a cyclic number.

It is not a de Polignac number, because 210010081 - 2²⁵ = 176455649 is a prime.

It is a super-2 number, since 2×210010081² = 88208468243253122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210010001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105005040 + 105005041.

It is an arithmetic number, because the mean of its divisors is an integer number (105005041).

Almost surely, 2^210010081 is an apocalyptic number.

It is an amenable number.

210010081 is a deficient number, since it is larger than the sum of its proper divisors (1).

210010081 is an equidigital number, since it uses as much as digits as its factorization.

210010081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 210010081 is about 14491.7245695604. The cubic root of 210010081 is about 594.4017063427.

Adding to 210010081 its reverse (180010012), we get a palindrome (390020093).

The spelling of 210010081 in words is "two hundred ten million, ten thousand, eighty-one".