21104024004 has 72 divisors (see below), whose sum is σ = 61004099520. Its totient is φ = 6026069952.

The previous prime is 21104023951. The next prime is 21104024021. The reversal of 21104024004 is 40042040112.

It is a super-3 number, since 3×21104024004³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 406167 + ... + 455169.

It is an arithmetic number, because the mean of its divisors is an integer number (847279160).

Almost surely, 2^21104024004 is an apocalyptic number.

It is an amenable number.

21104024004 is an abundant number, since it is smaller than the sum of its proper divisors (39900075516).

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

21104024004 is a wasteful number, since it uses less digits than its factorization.

21104024004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50729 (or 50724 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21104024004 its reverse (40042040112), we get a palindrome (61146064116).

The spelling of 21104024004 in words is "twenty-one billion, one hundred four million, twenty-four thousand, four".