21444243043 has 4 divisors (see below), whose sum is σ = 21764306440. Its totient is φ = 21124179648.

The previous prime is 21444243031. The next prime is 21444243089. The reversal of 21444243043 is 34034244412.

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 21444243043 - 2²¹ = 21442145891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21444242996 and 21444243014.

It is not an unprimeable number, because it can be changed into a prime (21444240043) 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, 160031598 + ... + 160031731.

It is an arithmetic number, because the mean of its divisors is an integer number (5441076610).

Almost surely, 2^21444243043 is an apocalyptic number.

21444243043 is a deficient number, since it is larger than the sum of its proper divisors (320063397).

21444243043 is an equidigital number, since it uses as much as digits as its factorization.

21444243043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320063396.

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

Adding to 21444243043 its reverse (34034244412), we get a palindrome (55478487455).

The spelling of 21444243043 in words is "twenty-one billion, four hundred forty-four million, two hundred forty-three thousand, forty-three".