21044420234143 has 4 divisors (see below), whose sum is σ = 21261373020160. Its totient is φ = 20827467448128.

The previous prime is 21044420234129. The next prime is 21044420234161. The reversal of 21044420234143 is 34143202444012.

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 21044420234143 - 2¹³ = 21044420225951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21044420234099 and 21044420234108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044420234113) 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 3 ways as a sum of consecutive naturals, for example, 108476392863 + ... + 108476393056.

It is an arithmetic number, because the mean of its divisors is an integer number (5315343255040).

Almost surely, 2^{21044420234143} is an apocalyptic number.

21044420234143 is a deficient number, since it is larger than the sum of its proper divisors (216952786017).

21044420234143 is an equidigital number, since it uses as much as digits as its factorization.

21044420234143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216952786016.

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 21044420234143 its reverse (34143202444012), we get a palindrome (55187622678155).

The spelling of 21044420234143 in words is "twenty-one trillion, forty-four billion, four hundred twenty million, two hundred thirty-four thousand, one hundred forty-three".