102555030821 has 2 divisors, whose sum is σ = 102555030822. Its totient is φ = 102555030820.

The previous prime is 102555030811. The next prime is 102555030847. The reversal of 102555030821 is 128030555201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69535053025 + 33019977796 = 263695^2 + 181714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102555030821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102555030811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51277515410 + 51277515411.

It is an arithmetic number, because the mean of its divisors is an integer number (51277515411).

Almost surely, 2^102555030821 is an apocalyptic number.

It is an amenable number.

102555030821 is a deficient number, since it is larger than the sum of its proper divisors (1).

102555030821 is an equidigital number, since it uses as much as digits as its factorization.

102555030821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 102555030821 in words is "one hundred two billion, five hundred fifty-five million, thirty thousand, eight hundred twenty-one".