21404144024 has 32 divisors (see below), whose sum is σ = 42269646000. Its totient is φ = 10132895232.

The previous prime is 21404143991. The next prime is 21404144033. The reversal of 21404144024 is 42044140412.

It is a junction number, because it is equal to n+sod(n) for n = 21404143984 and 21404144002.

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, 226292 + ... + 306620.

Almost surely, 2^21404144024 is an apocalyptic number.

It is an amenable number.

21404144024 is a deficient number, since it is larger than the sum of its proper divisors (20865501976).

21404144024 is a wasteful number, since it uses less digits than its factorization.

21404144024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82107 (or 82103 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21404144024 its reverse (42044140412), we get a palindrome (63448284436).

The spelling of 21404144024 in words is "twenty-one billion, four hundred four million, one hundred forty-four thousand, twenty-four".