21320544520000 has 560 divisors, whose sum is σ = 58501444795200. Its totient is φ = 7642286080000.

The previous prime is 21320544519979. The next prime is 21320544520013. The reversal of 21320544520000 is 2544502312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 17347879386 + ... + 17347880614.

Almost surely, 2^{21320544520000} is an apocalyptic number.

21320544520000 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 21320544520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29250722397600).

21320544520000 is an abundant number, since it is smaller than the sum of its proper divisors (37180900275200).

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

21320544520000 is a wasteful number, since it uses less digits than its factorization.

21320544520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The spelling of 21320544520000 in words is "twenty-one trillion, three hundred twenty billion, five hundred forty-four million, five hundred twenty thousand".