21499359816480 has 768 divisors, whose sum is σ = 83892486537216. Its totient is φ = 4506742702080.

The previous prime is 21499359816457. The next prime is 21499359816497. The reversal of 21499359816480 is 8461895399412.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 12405861694 + ... + 12405863426.

It is an arithmetic number, because the mean of its divisors is an integer number (109235008512).

Almost surely, 2^{21499359816480} is an apocalyptic number.

21499359816480 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 21499359816480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41946243268608).

21499359816480 is an abundant number, since it is smaller than the sum of its proper divisors (62393126720736).

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

21499359816480 is a wasteful number, since it uses less digits than its factorization.

21499359816480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449 (or 3441 counting only the distinct ones).

The product of its (nonzero) digits is 134369280, while the sum is 69.

The spelling of 21499359816480 in words is "twenty-one trillion, four hundred ninety-nine billion, three hundred fifty-nine million, eight hundred sixteen thousand, four hundred eighty".