21444032043 has 48 divisors (see below), whose sum is σ = 37001664000. Its totient is φ = 12238493904.

The previous prime is 21444031967. The next prime is 21444032143. The reversal of 21444032043 is 34023044412.

It is a happy number.

21444032043 is a `hidden beast` number, since 2 + 14 + 440 + 3 + 204 + 3 = 666.

It is not a de Polignac number, because 21444032043 - 2²⁹ = 20907161131 is a prime.

It is a super-2 number, since 2×21444032043² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21444031998 and 21444032016.

It is not an unprimeable number, because it can be changed into a prime (21444032143) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1100338 + ... + 1119656.

It is an arithmetic number, because the mean of its divisors is an integer number (770868000).

Almost surely, 2^21444032043 is an apocalyptic number.

21444032043 is a deficient number, since it is larger than the sum of its proper divisors (15557631957).

21444032043 is a wasteful number, since it uses less digits than its factorization.

21444032043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20181 (or 20168 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21444032043 its reverse (34023044412), we get a palindrome (55467076455).

The spelling of 21444032043 in words is "twenty-one billion, four hundred forty-four million, thirty-two thousand, forty-three".