21202310203 has 4 divisors (see below), whose sum is σ = 21221709568. Its totient is φ = 21182910840.

The previous prime is 21202310191. The next prime is 21202310219. The reversal of 21202310203 is 30201320212.

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 21202310203 - 2⁹ = 21202309691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202310803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9698043 + ... + 9700228.

It is an arithmetic number, because the mean of its divisors is an integer number (5305427392).

Almost surely, 2^21202310203 is an apocalyptic number.

21202310203 is a deficient number, since it is larger than the sum of its proper divisors (19399365).

21202310203 is a wasteful number, since it uses less digits than its factorization.

21202310203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19399364.

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

Adding to 21202310203 its reverse (30201320212), we get a palindrome (51403630415).

The spelling of 21202310203 in words is "twenty-one billion, two hundred two million, three hundred ten thousand, two hundred three".