21431052003 has 4 divisors (see below), whose sum is σ = 28574736008. Its totient is φ = 14287368000.

The previous prime is 21431052001. The next prime is 21431052031. The reversal of 21431052003 is 30025013412.

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

It is not a de Polignac number, because 21431052003 - 2¹ = 21431052001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431052001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571841998 + ... + 3571842003.

It is an arithmetic number, because the mean of its divisors is an integer number (7143684002).

Almost surely, 2^21431052003 is an apocalyptic number.

21431052003 is a deficient number, since it is larger than the sum of its proper divisors (7143684005).

21431052003 is an equidigital number, since it uses as much as digits as its factorization.

21431052003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7143684004.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21431052003 its reverse (30025013412), we get a palindrome (51456065415).

The spelling of 21431052003 in words is "twenty-one billion, four hundred thirty-one million, fifty-two thousand, three".