21303313313243 has 8 divisors (see below), whose sum is σ = 22948129755936. Its totient is φ = 19659368304000.

The previous prime is 21303313313213. The next prime is 21303313313279. The reversal of 21303313313243 is 34231331330312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21303313313243 - 2²⁸ = 21303044877787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303313313213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217807583 + ... + 217905368.

It is an arithmetic number, because the mean of its divisors is an integer number (2868516219492).

Almost surely, 2^{21303313313243} is an apocalyptic number.

21303313313243 is a deficient number, since it is larger than the sum of its proper divisors (1644816442693).

21303313313243 is a wasteful number, since it uses less digits than its factorization.

21303313313243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435716725.

The product of its (nonzero) digits is 34992, while the sum is 32.

Adding to 21303313313243 its reverse (34231331330312), we get a palindrome (55534644643555).

The spelling of 21303313313243 in words is "twenty-one trillion, three hundred three billion, three hundred thirteen million, three hundred thirteen thousand, two hundred forty-three".