21004247040000 has 680 divisors, whose sum is σ = 79993239469440. Its totient is φ = 4800774144000.

The previous prime is 21004247039917. The next prime is 21004247040001. The reversal of 21004247040000 is 4074240012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004247040001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 860147791 + ... + 860172209.

Almost surely, 2^{21004247040000} is an apocalyptic number.

21004247040000 is a gapful number since it is divisible by the number (20) 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 21004247040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39996619734720).

21004247040000 is an abundant number, since it is smaller than the sum of its proper divisors (58988992429440).

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

21004247040000 is an frugal number, since it uses more digits than its factorization.

21004247040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24481 (or 24436 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 24.

The spelling of 21004247040000 in words is "twenty-one trillion, four billion, two hundred forty-seven million, forty thousand".