210000010081 has 2 divisors, whose sum is σ = 210000010082. Its totient is φ = 210000010080.

The previous prime is 210000010079. The next prime is 210000010123. The reversal of 210000010081 is 180010000012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197099593681 + 12900416400 = 443959^2 + 113580^2 .

It is a cyclic number.

It is not a de Polignac number, because 210000010081 - 2¹ = 210000010079 is a prime.

It is a super-2 number, since 2×210000010081² (a number of 23 digits) contains 22 as substring.

Together with 210000010079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (210000020081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000005040 + 105000005041.

It is an arithmetic number, because the mean of its divisors is an integer number (105000005041).

Almost surely, 2^210000010081 is an apocalyptic number.

It is an amenable number.

210000010081 is a deficient number, since it is larger than the sum of its proper divisors (1).

210000010081 is an equidigital number, since it uses as much as digits as its factorization.

210000010081 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.

Adding to 210000010081 its reverse (180010000012), we get a palindrome (390010010093).

The spelling of 210000010081 in words is "two hundred ten billion, ten thousand, eighty-one".