21001324003 has 16 divisors (see below), whose sum is σ = 23030272512. Its totient is φ = 18992584000.

The previous prime is 21001323997. The next prime is 21001324013. The reversal of 21001324003 is 30042310012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001324003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001324013) 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 15 ways as a sum of consecutive naturals, for example, 1776450 + ... + 1788232.

It is an arithmetic number, because the mean of its divisors is an integer number (1439392032).

Almost surely, 2^21001324003 is an apocalyptic number.

21001324003 is a deficient number, since it is larger than the sum of its proper divisors (2028948509).

21001324003 is a wasteful number, since it uses less digits than its factorization.

21001324003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12626.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21001324003 its reverse (30042310012), we get a palindrome (51043634015).

The spelling of 21001324003 in words is "twenty-one billion, one million, three hundred twenty-four thousand, three".