21440224520000 has 560 divisors, whose sum is σ = 62550997673472. Its totient is φ = 7186160640000.

The previous prime is 21440224519981. The next prime is 21440224520027. The reversal of 21440224520000 is 2542204412.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 4558837649 + ... + 4558842351.

Almost surely, 2^{21440224520000} is an apocalyptic number.

21440224520000 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 21440224520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31275498836736).

21440224520000 is an abundant number, since it is smaller than the sum of its proper divisors (41110773153472).

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

21440224520000 is a wasteful number, since it uses less digits than its factorization.

21440224520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556 (or 5531 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

Adding to 21440224520000 its reverse (2542204412), we get a palindrome (21442766724412).

The spelling of 21440224520000 in words is "twenty-one trillion, four hundred forty billion, two hundred twenty-four million, five hundred twenty thousand".