102102221021989 has 2 divisors, whose sum is σ = 102102221021990. Its totient is φ = 102102221021988.

The previous prime is 102102221021959. The next prime is 102102221022017. The reversal of 102102221021989 is 989120122201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72856211292225 + 29246009729764 = 8535585^2 + 5407958^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102221021989 - 2⁹ = 102102221021477 is a prime.

It is a super-2 number, since 2×102102221021989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102102221021929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051110510994 + 51051110510995.

It is an arithmetic number, because the mean of its divisors is an integer number (51051110510995).

Almost surely, 2^{102102221021989} is an apocalyptic number.

It is an amenable number.

102102221021989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102221021989 is an equidigital number, since it uses as much as digits as its factorization.

102102221021989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 40.

The spelling of 102102221021989 in words is "one hundred two trillion, one hundred two billion, two hundred twenty-one million, twenty-one thousand, nine hundred eighty-nine".