21004241025824 has 192 divisors, whose sum is σ = 49822458739200. Its totient is φ = 8522122076160.

The previous prime is 21004241025791. The next prime is 21004241025827. The reversal of 21004241025824 is 42852014240012.

It is not an unprimeable number, because it can be changed into a prime (21004241025827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215660402 + ... + 215757774.

It is an arithmetic number, because the mean of its divisors is an integer number (259491972600).

Almost surely, 2^{21004241025824} 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 21004241025824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24911229369600).

21004241025824 is an abundant number, since it is smaller than the sum of its proper divisors (28818217713376).

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

21004241025824 is a wasteful number, since it uses less digits than its factorization.

21004241025824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97843 (or 97835 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 35.

Adding to 21004241025824 its reverse (42852014240012), we get a palindrome (63856255265836).

The spelling of 21004241025824 in words is "twenty-one trillion, four billion, two hundred forty-one million, twenty-five thousand, eight hundred twenty-four".