21343444343 has 16 divisors (see below), whose sum is σ = 24026950080. Its totient is φ = 18811778304.

The previous prime is 21343444303. The next prime is 21343444351. The reversal of 21343444343 is 34344434312.

It is a cyclic number.

It is not a de Polignac number, because 21343444343 - 2⁶ = 21343444279 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 (21343444303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107405 + ... + 232857.

It is an arithmetic number, because the mean of its divisors is an integer number (1501684380).

Almost surely, 2^21343444343 is an apocalyptic number.

21343444343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21343444343 is a deficient number, since it is larger than the sum of its proper divisors (2683505737).

21343444343 is a wasteful number, since it uses less digits than its factorization.

21343444343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126058.

The product of its digits is 165888, while the sum is 35.

Adding to 21343444343 its reverse (34344434312), we get a palindrome (55687878655).

The spelling of 21343444343 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-four thousand, three hundred forty-three".