21303134240303 has 4 divisors (see below), whose sum is σ = 21338698738800. Its totient is φ = 21267569741808.

The previous prime is 21303134240281. The next prime is 21303134240309. The reversal of 21303134240303 is 30304243130312.

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 21303134240303 - 2⁶ = 21303134240239 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 (21303134240309) 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, 17782248350 + ... + 17782249547.

It is an arithmetic number, because the mean of its divisors is an integer number (5334674684700).

Almost surely, 2^{21303134240303} is an apocalyptic number.

21303134240303 is a deficient number, since it is larger than the sum of its proper divisors (35564498497).

21303134240303 is an equidigital number, since it uses as much as digits as its factorization.

21303134240303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35564498496.

The product of its (nonzero) digits is 15552, while the sum is 29.

Adding to 21303134240303 its reverse (30304243130312), we get a palindrome (51607377370615).

The spelling of 21303134240303 in words is "twenty-one trillion, three hundred three billion, one hundred thirty-four million, two hundred forty thousand, three hundred three".