500021867923 has 4 divisors (see below), whose sum is σ = 526338808360. Its totient is φ = 473704927488.

The previous prime is 500021867893. The next prime is 500021867929. The reversal of 500021867923 is 329768120005.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-500021867923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 500021867923.

It is not an unprimeable number, because it can be changed into a prime (500021867929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13158470190 + ... + 13158470227.

It is an arithmetic number, because the mean of its divisors is an integer number (131584702090).

Almost surely, 2^500021867923 is an apocalyptic number.

500021867923 is a deficient number, since it is larger than the sum of its proper divisors (26316940437).

500021867923 is a wasteful number, since it uses less digits than its factorization.

500021867923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26316940436.

The product of its (nonzero) digits is 181440, while the sum is 43.

Adding to 500021867923 its reverse (329768120005), we get a palindrome (829789987928).

The spelling of 500021867923 in words is "five hundred billion, twenty-one million, eight hundred sixty-seven thousand, nine hundred twenty-three".