21313202303 has 4 divisors (see below), whose sum is σ = 21674443080. Its totient is φ = 20951961528.

The previous prime is 21313202297. The next prime is 21313202341. The reversal of 21313202303 is 30320231312.

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

It is a de Polignac number, because none of the positive numbers 2^k-21313202303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313202803) 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, 180620300 + ... + 180620417.

It is an arithmetic number, because the mean of its divisors is an integer number (5418610770).

Almost surely, 2^21313202303 is an apocalyptic number.

21313202303 is a deficient number, since it is larger than the sum of its proper divisors (361240777).

21313202303 is an equidigital number, since it uses as much as digits as its factorization.

21313202303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361240776.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21313202303 its reverse (30320231312), we get a palindrome (51633433615).

The spelling of 21313202303 in words is "twenty-one billion, three hundred thirteen million, two hundred two thousand, three hundred three".