21046244104704 has 640 divisors, whose sum is σ = 70820067225600. Its totient is φ = 5405353574400.

The previous prime is 21046244104667. The next prime is 21046244104771. The reversal of 21046244104704 is 40740144264012.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 63 ways as a sum of consecutive naturals, for example, 3432755719 + ... + 3432761849.

It is an arithmetic number, because the mean of its divisors is an integer number (110656355040).

Almost surely, 2^{21046244104704} is an apocalyptic number.

21046244104704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21046244104704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35410033612800).

21046244104704 is an abundant number, since it is smaller than the sum of its proper divisors (49773823120896).

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

21046244104704 is a wasteful number, since it uses less digits than its factorization.

21046244104704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812 (or 6796 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 39.

Adding to 21046244104704 its reverse (40740144264012), we get a palindrome (61786388368716).

The spelling of 21046244104704 in words is "twenty-one trillion, forty-six billion, two hundred forty-four million, one hundred four thousand, seven hundred four".