21444004324 has 12 divisors (see below), whose sum is σ = 37534420224. Its totient is φ = 10719884264.

The previous prime is 21444004319. The next prime is 21444004331. The reversal of 21444004324 is 42340044412.

It is a junction number, because it is equal to n+sod(n) for n = 21444004292 and 21444004301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506584 + ... + 547279.

It is an arithmetic number, because the mean of its divisors is an integer number (3127868352).

Almost surely, 2^21444004324 is an apocalyptic number.

It is an amenable number.

21444004324 is a deficient number, since it is larger than the sum of its proper divisors (16090415900).

21444004324 is a wasteful number, since it uses less digits than its factorization.

21444004324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058954 (or 1058952 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21444004324 its reverse (42340044412), we get a palindrome (63784048736).

The spelling of 21444004324 in words is "twenty-one billion, four hundred forty-four million, four thousand, three hundred twenty-four".