21315043343 has 24 divisors (see below), whose sum is σ = 24855791184. Its totient is φ = 18201680640.

The previous prime is 21315043313. The next prime is 21315043447. The reversal of 21315043343 is 34334051312.

It is not a de Polignac number, because 21315043343 - 2¹⁶ = 21314977807 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 (21315043303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1065905 + ... + 1085717.

It is an arithmetic number, because the mean of its divisors is an integer number (1035657966).

Almost surely, 2^21315043343 is an apocalyptic number.

21315043343 is a deficient number, since it is larger than the sum of its proper divisors (3540747841).

21315043343 is a wasteful number, since it uses less digits than its factorization.

21315043343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20375 (or 20364 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 21315043343 its reverse (34334051312), we get a palindrome (55649094655).

The spelling of 21315043343 in words is "twenty-one billion, three hundred fifteen million, forty-three thousand, three hundred forty-three".