21443304124 has 24 divisors (see below), whose sum is σ = 40940965296. Its totient is φ = 9746064000.

The previous prime is 21443304109. The next prime is 21443304151. The reversal of 21443304124 is 42140334412.

It is a junction number, because it is equal to n+sod(n) for n = 21443304092 and 21443304101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 826794 + ... + 852334.

It is an arithmetic number, because the mean of its divisors is an integer number (1705873554).

Almost surely, 2^21443304124 is an apocalyptic number.

It is an amenable number.

21443304124 is a deficient number, since it is larger than the sum of its proper divisors (19497661172).

21443304124 is a wasteful number, since it uses less digits than its factorization.

21443304124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44637 (or 44635 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21443304124 its reverse (42140334412), we get a palindrome (63583638536).

The spelling of 21443304124 in words is "twenty-one billion, four hundred forty-three million, three hundred four thousand, one hundred twenty-four".