21344212343 has 4 divisors (see below), whose sum is σ = 22467591960. Its totient is φ = 20220832728.

The previous prime is 21344212327. The next prime is 21344212361. The reversal of 21344212343 is 34321244312.

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 21344212343 - 2⁴ = 21344212327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344214343) 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, 561689780 + ... + 561689817.

It is an arithmetic number, because the mean of its divisors is an integer number (5616897990).

Almost surely, 2^21344212343 is an apocalyptic number.

21344212343 is a deficient number, since it is larger than the sum of its proper divisors (1123379617).

21344212343 is a wasteful number, since it uses less digits than its factorization.

21344212343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123379616.

The product of its digits is 13824, while the sum is 29.

Adding to 21344212343 its reverse (34321244312), we get a palindrome (55665456655).

The spelling of 21344212343 in words is "twenty-one billion, three hundred forty-four million, two hundred twelve thousand, three hundred forty-three".