21202313203 has 4 divisors (see below), whose sum is σ = 21408161008. Its totient is φ = 20996465400.

The previous prime is 21202313191. The next prime is 21202313227. The reversal of 21202313203 is 30231320212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202313203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202313243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102923748 + ... + 102923953.

It is an arithmetic number, because the mean of its divisors is an integer number (5352040252).

Almost surely, 2^21202313203 is an apocalyptic number.

21202313203 is a deficient number, since it is larger than the sum of its proper divisors (205847805).

21202313203 is a wasteful number, since it uses less digits than its factorization.

21202313203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205847804.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21202313203 its reverse (30231320212), we get a palindrome (51433633415).

The spelling of 21202313203 in words is "twenty-one billion, two hundred two million, three hundred thirteen thousand, two hundred three".