102102221009 has 2 divisors, whose sum is σ = 102102221010. Its totient is φ = 102102221008.

The previous prime is 102102220991. The next prime is 102102221041. The reversal of 102102221009 is 900122201201.

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., 80002425409 + 22099795600 = 282847^2 + 148660^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102221009 - 2¹² = 102102216913 is a prime.

It is not a weakly prime, because it can be changed into another prime (102102221609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051110504 + 51051110505.

It is an arithmetic number, because the mean of its divisors is an integer number (51051110505).

Almost surely, 2^102102221009 is an apocalyptic number.

It is an amenable number.

102102221009 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102221009 is an equidigital number, since it uses as much as digits as its factorization.

102102221009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 102102221009 in words is "one hundred two billion, one hundred two million, two hundred twenty-one thousand, nine".