210102102099991 has 2 divisors, whose sum is σ = 210102102099992. Its totient is φ = 210102102099990.

The previous prime is 210102102099971. The next prime is 210102102100063. The reversal of 210102102099991 is 199990201201012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210102102099991 - 2¹⁹ = 210102101575703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210102102099931) 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, 105051051049995 + 105051051049996.

It is an arithmetic number, because the mean of its divisors is an integer number (105051051049996).

Almost surely, 2^{210102102099991} is an apocalyptic number.

210102102099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

210102102099991 is an equidigital number, since it uses as much as digits as its factorization.

210102102099991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 46.

The spelling of 210102102099991 in words is "two hundred ten trillion, one hundred two billion, one hundred two million, ninety-nine thousand, nine hundred ninety-one".