210102001021009 has 2 divisors, whose sum is σ = 210102001021010. Its totient is φ = 210102001021008.

The previous prime is 210102001021001. The next prime is 210102001021063. The reversal of 210102001021009 is 900120100201012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125376235305409 + 84725765715600 = 11197153^2 + 9204660^2 .

It is a cyclic number.

It is not a de Polignac number, because 210102001021009 - 2³ = 210102001021001 is a prime.

It is not a weakly prime, because it can be changed into another prime (210102001021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105051000510504 + 105051000510505.

It is an arithmetic number, because the mean of its divisors is an integer number (105051000510505).

Almost surely, 2^{210102001021009} is an apocalyptic number.

It is an amenable number.

210102001021009 is a deficient number, since it is larger than the sum of its proper divisors (1).

210102001021009 is an equidigital number, since it uses as much as digits as its factorization.

210102001021009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 210102001021009 in words is "two hundred ten trillion, one hundred two billion, one million, twenty-one thousand, nine".