21389124823 has 8 divisors (see below), whose sum is σ = 23681854080. Its totient is φ = 19154439480.

The previous prime is 21389124803. The next prime is 21389124853. The reversal of 21389124823 is 32842198312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21389124823 - 2⁵ = 21389124791 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 21389124823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21389124803) 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 7 ways as a sum of consecutive naturals, for example, 14510203 + ... + 14511676.

It is an arithmetic number, because the mean of its divisors is an integer number (2960231760).

Almost surely, 2^21389124823 is an apocalyptic number.

21389124823 is a deficient number, since it is larger than the sum of its proper divisors (2292729257).

21389124823 is a wasteful number, since it uses less digits than its factorization.

21389124823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29021957.

The product of its digits is 165888, while the sum is 43.

The spelling of 21389124823 in words is "twenty-one billion, three hundred eighty-nine million, one hundred twenty-four thousand, eight hundred twenty-three".