21340344423343 has 4 divisors (see below), whose sum is σ = 23280375734568. Its totient is φ = 19400313112120.

The previous prime is 21340344423341. The next prime is 21340344423361. The reversal of 21340344423343 is 34332444304312.

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 21340344423343 - 2¹ = 21340344423341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21340344423296 and 21340344423305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340344423341) 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, 970015655596 + ... + 970015655617.

It is an arithmetic number, because the mean of its divisors is an integer number (5820093933642).

Almost surely, 2^{21340344423343} is an apocalyptic number.

21340344423343 is a deficient number, since it is larger than the sum of its proper divisors (1940031311225).

21340344423343 is a wasteful number, since it uses less digits than its factorization.

21340344423343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940031311224.

The product of its (nonzero) digits is 995328, while the sum is 40.

Adding to 21340344423343 its reverse (34332444304312), we get a palindrome (55672788727655).

The spelling of 21340344423343 in words is "twenty-one trillion, three hundred forty billion, three hundred forty-four million, four hundred twenty-three thousand, three hundred forty-three".