102102120209989 has 2 divisors, whose sum is σ = 102102120209990. Its totient is φ = 102102120209988.

The previous prime is 102102120209951. The next prime is 102102120210037. The reversal of 102102120209989 is 989902021201201.

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., 92759377781889 + 9342742428100 = 9631167^2 + 3056590^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102120209989 - 2³⁷ = 101964681256517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102102120209939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051060104994 + 51051060104995.

It is an arithmetic number, because the mean of its divisors is an integer number (51051060104995).

Almost surely, 2^{102102120209989} is an apocalyptic number.

It is an amenable number.

102102120209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102120209989 is an equidigital number, since it uses as much as digits as its factorization.

102102120209989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 102102120209989 in words is "one hundred two trillion, one hundred two billion, one hundred twenty million, two hundred nine thousand, nine hundred eighty-nine".