210102102021209 has 2 divisors, whose sum is σ = 210102102021210. Its totient is φ = 210102102021208.

The previous prime is 210102102021181. The next prime is 210102102021221. The reversal of 210102102021209 is 902120201201012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205342164955225 + 4759937065984 = 14329765^2 + 2181728^2 .

It is a cyclic number.

It is not a de Polignac number, because 210102102021209 - 2¹² = 210102102017113 is a prime.

It is not a weakly prime, because it can be changed into another prime (210102102021239) 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, 105051051010604 + 105051051010605.

It is an arithmetic number, because the mean of its divisors is an integer number (105051051010605).

Almost surely, 2^{210102102021209} is an apocalyptic number.

It is an amenable number.

210102102021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

210102102021209 is an equidigital number, since it uses as much as digits as its factorization.

210102102021209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 210102102021209 in words is "two hundred ten trillion, one hundred two billion, one hundred two million, twenty-one thousand, two hundred nine".