21303030203 has 16 divisors (see below), whose sum is σ = 26292188160. Its totient is φ = 16808168736.

The previous prime is 21303030187. The next prime is 21303030233. The reversal of 21303030203 is 30203030312.

It is a cyclic number.

It is not a de Polignac number, because 21303030203 - 2⁴ = 21303030187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303030233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293375 + ... + 358712.

It is an arithmetic number, because the mean of its divisors is an integer number (1643261760).

Almost surely, 2^21303030203 is an apocalyptic number.

21303030203 is a deficient number, since it is larger than the sum of its proper divisors (4989157957).

21303030203 is a wasteful number, since it uses less digits than its factorization.

21303030203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652466.

The product of its (nonzero) digits is 324, while the sum is 17.

Adding to 21303030203 its reverse (30203030312), we get a palindrome (51506060515).

The spelling of 21303030203 in words is "twenty-one billion, three hundred three million, thirty thousand, two hundred three".