21271360343 has 4 divisors (see below), whose sum is σ = 21281846040. Its totient is φ = 21260874648.

The previous prime is 21271360321. The next prime is 21271360349. The reversal of 21271360343 is 34306317212.

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-21271360343 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 (21271360349) 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, 5239805 + ... + 5243862.

It is an arithmetic number, because the mean of its divisors is an integer number (5320461510).

Almost surely, 2^21271360343 is an apocalyptic number.

21271360343 is a deficient number, since it is larger than the sum of its proper divisors (10485697).

21271360343 is a wasteful number, since it uses less digits than its factorization.

21271360343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10485696.

The product of its (nonzero) digits is 18144, while the sum is 32.

Adding to 21271360343 its reverse (34306317212), we get a palindrome (55577677555).

The spelling of 21271360343 in words is "twenty-one billion, two hundred seventy-one million, three hundred sixty thousand, three hundred forty-three".