21340244443 has 8 divisors (see below), whose sum is σ = 24523597280. Its totient is φ = 18190578240.

The previous prime is 21340244407. The next prime is 21340244501. The reversal of 21340244443 is 34444204312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21340244443 - 2¹⁷ = 21340113371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21340241443) 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 7 ways as a sum of consecutive naturals, for example, 8420298 + ... + 8422831.

It is an arithmetic number, because the mean of its divisors is an integer number (3065449660).

Almost surely, 2^21340244443 is an apocalyptic number.

21340244443 is a deficient number, since it is larger than the sum of its proper divisors (3183352837).

21340244443 is a wasteful number, since it uses less digits than its factorization.

21340244443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16843317.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 21340244443 its reverse (34444204312), we get a palindrome (55784448755).

The spelling of 21340244443 in words is "twenty-one billion, three hundred forty million, two hundred forty-four thousand, four hundred forty-three".