500555500021 has 2 divisors, whose sum is σ = 500555500022. Its totient is φ = 500555500020.

The previous prime is 500555500001. The next prime is 500555500051. The reversal of 500555500021 is 120005555005.

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., 489923003025 + 10632496996 = 699945^2 + 103114^2 .

It is a cyclic number.

It is not a de Polignac number, because 500555500021 - 2¹¹ = 500555497973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (500555500001) 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, 250277750010 + 250277750011.

It is an arithmetic number, because the mean of its divisors is an integer number (250277750011).

Almost surely, 2^500555500021 is an apocalyptic number.

It is an amenable number.

500555500021 is a deficient number, since it is larger than the sum of its proper divisors (1).

500555500021 is an equidigital number, since it uses as much as digits as its factorization.

500555500021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6250, while the sum is 28.

The spelling of 500555500021 in words is "five hundred billion, five hundred fifty-five million, five hundred thousand, twenty-one".