102110300021 has 2 divisors, whose sum is σ = 102110300022. Its totient is φ = 102110300020.

The previous prime is 102110299979. The next prime is 102110300053. The reversal of 102110300021 is 120003011201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101897577796 + 212722225 = 319214^2 + 14585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102110300021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 102110299975 and 102110300011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102110300081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51055150010 + 51055150011.

It is an arithmetic number, because the mean of its divisors is an integer number (51055150011).

Almost surely, 2^102110300021 is an apocalyptic number.

It is an amenable number.

102110300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102110300021 is an equidigital number, since it uses as much as digits as its factorization.

102110300021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 102110300021 its reverse (120003011201), we get a palindrome (222113311222).

The spelling of 102110300021 in words is "one hundred two billion, one hundred ten million, three hundred thousand, twenty-one".