500006500021 has 16 divisors (see below), whose sum is σ = 591166108800. Its totient is φ = 413780689728.

The previous prime is 500006499973. The next prime is 500006500051. The reversal of 500006500021 is 120005600005.

It is a happy number.

500006500021 is a nontrivial binomial coefficient, being equal to C(1000007, 2).

It is not a de Polignac number, because 500006500021 - 2²¹ = 500004402869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500006500051) 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 in 15 ways as a sum of consecutive naturals, for example, 6964335 + ... + 7035763.

It is an arithmetic number, because the mean of its divisors is an integer number (36947881800).

Almost surely, 2^500006500021 is an apocalyptic number.

500006500021 is the 1000006-th triangular number.

500006500021 is the 333336-th centered nonagonal number.

It is an amenable number.

500006500021 is a deficient number, since it is larger than the sum of its proper divisors (91159608779).

500006500021 is a wasteful number, since it uses less digits than its factorization.

500006500021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105948.

The product of its (nonzero) digits is 300, while the sum is 19.

The spelling of 500006500021 in words is "five hundred billion, six million, five hundred thousand, twenty-one".