21104240000 has 80 divisors (see below), whose sum is σ = 52537885620. Its totient is φ = 8441664000.

The previous prime is 21104239999. The next prime is 21104240107. The reversal of 21104240000 is 4240112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 51902 + ... + 211901.

Almost surely, 2^21104240000 is an apocalyptic number.

21104240000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104240000 is an abundant number, since it is smaller than the sum of its proper divisors (31433645620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21104240000 is an frugal number, since it uses more digits than its factorization.

21104240000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263837 (or 263810 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21104240000 its reverse (4240112), we get a palindrome (21108480112).

The spelling of 21104240000 in words is "twenty-one billion, one hundred four million, two hundred forty thousand".