102605634821 has 2 divisors, whose sum is σ = 102605634822. Its totient is φ = 102605634820.

The previous prime is 102605634763. The next prime is 102605634827. The reversal of 102605634821 is 128436506201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102508828900 + 96805921 = 320170^2 + 9839^2 .

It is a cyclic number.

It is not a de Polignac number, because 102605634821 - 2¹⁰ = 102605633797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102605634827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51302817410 + 51302817411.

It is an arithmetic number, because the mean of its divisors is an integer number (51302817411).

Almost surely, 2^102605634821 is an apocalyptic number.

It is an amenable number.

102605634821 is a deficient number, since it is larger than the sum of its proper divisors (1).

102605634821 is an equidigital number, since it uses as much as digits as its factorization.

102605634821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 102605634821 in words is "one hundred two billion, six hundred five million, six hundred thirty-four thousand, eight hundred twenty-one".