21224032520320 has 256 divisors, whose sum is σ = 58827317126400. Its totient is φ = 7172091150336.

The previous prime is 21224032520297. The next prime is 21224032520333. The reversal of 21224032520320 is 2302523042212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90499852 + ... + 90734068.

It is an arithmetic number, because the mean of its divisors is an integer number (229794207525).

Almost surely, 2^{21224032520320} is an apocalyptic number.

21224032520320 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 21224032520320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29413658563200).

21224032520320 is an abundant number, since it is smaller than the sum of its proper divisors (37603284606080).

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

21224032520320 is a wasteful number, since it uses less digits than its factorization.

21224032520320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234535 (or 234523 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 21224032520320 its reverse (2302523042212), we get a palindrome (23526555562532).

The spelling of 21224032520320 in words is "twenty-one trillion, two hundred twenty-four billion, thirty-two million, five hundred twenty thousand, three hundred twenty".