21231304003 has 24 divisors (see below), whose sum is σ = 26783910944. Its totient is φ = 16388559360.

The previous prime is 21231303997. The next prime is 21231304009. The reversal of 21231304003 is 30040313212.

It is an interprime number because it is at equal distance from previous prime (21231303997) and next prime (21231304009).

It is not a de Polignac number, because 21231304003 - 2⁵ = 21231303971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21231304009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83575 + ... + 222367.

Almost surely, 2^21231304003 is an apocalyptic number.

21231304003 is a deficient number, since it is larger than the sum of its proper divisors (5552606941).

21231304003 is a wasteful number, since it uses less digits than its factorization.

21231304003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138895 (or 138854 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21231304003 its reverse (30040313212), we get a palindrome (51271617215).

The spelling of 21231304003 in words is "twenty-one billion, two hundred thirty-one million, three hundred four thousand, three".