21013204003 has 6 divisors (see below), whose sum is σ = 23097158252. Its totient is φ = 19102912620.

The previous prime is 21013204001. The next prime is 21013204007. The reversal of 21013204003 is 30040231012.

It is a happy number.

It is not a de Polignac number, because 21013204003 - 2¹ = 21013204001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013204001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86831301 + ... + 86831542.

Almost surely, 2^21013204003 is an apocalyptic number.

21013204003 is a deficient number, since it is larger than the sum of its proper divisors (2083954249).

21013204003 is a wasteful number, since it uses less digits than its factorization.

21013204003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173662865 (or 173662854 counting only the distinct ones).

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

Adding to 21013204003 its reverse (30040231012), we get a palindrome (51053435015).

The spelling of 21013204003 in words is "twenty-one billion, thirteen million, two hundred four thousand, three".