102219999809 has 2 divisors, whose sum is σ = 102219999810. Its totient is φ = 102219999808.

The previous prime is 102219999787. The next prime is 102219999821. The reversal of 102219999809 is 908999912201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55898199184 + 46321800625 = 236428^2 + 215225^2 .

It is an emirp because it is prime and its reverse (908999912201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102219999809 - 2²⁴ = 102203222593 is a prime.

It is not a weakly prime, because it can be changed into another prime (102219999899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51109999904 + 51109999905.

It is an arithmetic number, because the mean of its divisors is an integer number (51109999905).

Almost surely, 2^102219999809 is an apocalyptic number.

It is an amenable number.

102219999809 is a deficient number, since it is larger than the sum of its proper divisors (1).

102219999809 is an equidigital number, since it uses as much as digits as its factorization.

102219999809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 59.

The spelling of 102219999809 in words is "one hundred two billion, two hundred nineteen million, nine hundred ninety-nine thousand, eight hundred nine".