21404104024 has 16 divisors (see below), whose sum is σ = 40159706400. Its totient is φ = 10694848992.

The previous prime is 21404104009. The next prime is 21404104049. The reversal of 21404104024 is 42040140412.

It is a junction number, because it is equal to n+sod(n) for n = 21404103986 and 21404104004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887739 + ... + 911530.

It is an arithmetic number, because the mean of its divisors is an integer number (2509981650).

Almost surely, 2^21404104024 is an apocalyptic number.

It is an amenable number.

21404104024 is a deficient number, since it is larger than the sum of its proper divisors (18755602376).

21404104024 is a wasteful number, since it uses less digits than its factorization.

21404104024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800762 (or 1800758 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21404104024 its reverse (42040140412), we get a palindrome (63444244436).

The spelling of 21404104024 in words is "twenty-one billion, four hundred four million, one hundred four thousand, twenty-four".