21443440224 has 96 divisors (see below), whose sum is σ = 59097717504. Its totient is φ = 6794979840.

The previous prime is 21443440211. The next prime is 21443440273. The reversal of 21443440224 is 42204434412.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21443440224² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21443440191 and 21443440200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330114 + ... + 389694.

It is an arithmetic number, because the mean of its divisors is an integer number (615601224).

Almost surely, 2^21443440224 is an apocalyptic number.

21443440224 is a gapful number since it is divisible by the number (24) 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 21443440224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29548858752).

21443440224 is an abundant number, since it is smaller than the sum of its proper divisors (37654277280).

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

21443440224 is a wasteful number, since it uses less digits than its factorization.

21443440224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59780 (or 59772 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 21443440224 its reverse (42204434412), we get a palindrome (63647874636).

The spelling of 21443440224 in words is "twenty-one billion, four hundred forty-three million, four hundred forty thousand, two hundred twenty-four".