102102002021 has 2 divisors, whose sum is σ = 102102002022. Its totient is φ = 102102002020.

The previous prime is 102102001997. The next prime is 102102002027. The reversal of 102102002021 is 120200201201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67982740225 + 34119261796 = 260735^2 + 184714^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102002021 - 2⁶ = 102102001957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102102001993 and 102102002011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102102002027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051001010 + 51051001011.

It is an arithmetic number, because the mean of its divisors is an integer number (51051001011).

Almost surely, 2^102102002021 is an apocalyptic number.

It is an amenable number.

102102002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102002021 is an equidigital number, since it uses as much as digits as its factorization.

102102002021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102102002021 its reverse (120200201201), we get a palindrome (222302203222).

The spelling of 102102002021 in words is "one hundred two billion, one hundred two million, two thousand, twenty-one".