21440550325440 has 448 divisors, whose sum is σ = 71686030993920. Its totient is φ = 5422176829440.

The previous prime is 21440550325423. The next prime is 21440550325463. The reversal of 21440550325440 is 4452305504412.

It is a super-2 number, since 2×21440550325440² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1693693831 + ... + 1693706489.

It is an arithmetic number, because the mean of its divisors is an integer number (160013462040).

Almost surely, 2^{21440550325440} is an apocalyptic number.

21440550325440 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 21440550325440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35843015496960).

21440550325440 is an abundant number, since it is smaller than the sum of its proper divisors (50245480668480).

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

21440550325440 is a wasteful number, since it uses less digits than its factorization.

21440550325440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13920 (or 13910 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 39.

Adding to 21440550325440 its reverse (4452305504412), we get a palindrome (25892855829852).

The spelling of 21440550325440 in words is "twenty-one trillion, four hundred forty billion, five hundred fifty million, three hundred twenty-five thousand, four hundred forty".