102102011989 has 2 divisors, whose sum is σ = 102102011990. Its totient is φ = 102102011988.

The previous prime is 102102011987. The next prime is 102102012007. The reversal of 102102011989 is 989110201201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80502712900 + 21599299089 = 283730^2 + 146967^2 .

It is an emirp because it is prime and its reverse (989110201201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102102011989 - 2¹ = 102102011987 is a prime.

It is a super-2 number, since 2×102102011989² (a number of 23 digits) contains 22 as substring.

Together with 102102011987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102102011987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051005994 + 51051005995.

It is an arithmetic number, because the mean of its divisors is an integer number (51051005995).

Almost surely, 2^102102011989 is an apocalyptic number.

It is an amenable number.

102102011989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102011989 is an equidigital number, since it uses as much as digits as its factorization.

102102011989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 102102011989 in words is "one hundred two billion, one hundred two million, eleven thousand, nine hundred eighty-nine".