21204303203 has 4 divisors (see below), whose sum is σ = 21205035600. Its totient is φ = 21203570808.

The previous prime is 21204303193. The next prime is 21204303223. The reversal of 21204303203 is 30230340212.

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 21204303203 - 2⁶ = 21204303139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204303223) 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, 320903 + ... + 381296.

It is an arithmetic number, because the mean of its divisors is an integer number (5301258900).

Almost surely, 2^21204303203 is an apocalyptic number.

21204303203 is a deficient number, since it is larger than the sum of its proper divisors (732397).

21204303203 is an equidigital number, since it uses as much as digits as its factorization.

21204303203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732396.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21204303203 its reverse (30230340212), we get a palindrome (51434643415).

The spelling of 21204303203 in words is "twenty-one billion, two hundred four million, three hundred three thousand, two hundred three".