21204130024 has 96 divisors (see below), whose sum is σ = 50000509440. Its totient is φ = 8251943040.

The previous prime is 21204129959. The next prime is 21204130069. The reversal of 21204130024 is 42003140212.

It is a junction number, because it is equal to n+sod(n) for n = 21204129983 and 21204130010.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10616994 + ... + 10618990.

It is an arithmetic number, because the mean of its divisors is an integer number (520838640).

Almost surely, 2^21204130024 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21204130024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25000254720).

21204130024 is an abundant number, since it is smaller than the sum of its proper divisors (28796379416).

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

21204130024 is a wasteful number, since it uses less digits than its factorization.

21204130024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3599 (or 3584 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21204130024 its reverse (42003140212), we get a palindrome (63207270236).

The spelling of 21204130024 in words is "twenty-one billion, two hundred four million, one hundred thirty thousand, twenty-four".