21303002003 has 4 divisors (see below), whose sum is σ = 21990195648. Its totient is φ = 20615808360.

The previous prime is 21303001957. The next prime is 21303002041. The reversal of 21303002003 is 30020030312.

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

It is a cyclic number.

It is not a de Polignac number, because 21303002003 - 2¹⁸ = 21302739859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303002603) 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, 343596776 + ... + 343596837.

It is an arithmetic number, because the mean of its divisors is an integer number (5497548912).

Almost surely, 2^21303002003 is an apocalyptic number.

21303002003 is a deficient number, since it is larger than the sum of its proper divisors (687193645).

21303002003 is an equidigital number, since it uses as much as digits as its factorization.

21303002003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687193644.

The product of its (nonzero) digits is 108, while the sum is 14.

Adding to 21303002003 its reverse (30020030312), we get a palindrome (51323032315).

The spelling of 21303002003 in words is "twenty-one billion, three hundred three million, two thousand, three".