21444120422244 has 144 divisors (see below), whose sum is σ = 59093300094192. Its totient is φ = 6517474983936.

The previous prime is 21444120422191. The next prime is 21444120422299. The reversal of 21444120422244 is 44222402144412.

21444120422244 is a `hidden beast` number, since 2 + 1 + 4 + 441 + 204 + 2 + 2 + 2 + 4 + 4 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 309872582244 + 21134247840000 = 556662^2 + 4597200^2 .

It is a super-3 number, since 3×21444120422244³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21444120422199 and 21444120422208.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14803044 + ... + 16186980.

It is an arithmetic number, because the mean of its divisors is an integer number (410370139543).

Almost surely, 2^{21444120422244} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21444120422244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29546650047096).

21444120422244 is an abundant number, since it is smaller than the sum of its proper divisors (37649179671948).

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

21444120422244 is a wasteful number, since it uses less digits than its factorization.

21444120422244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384366 (or 1384361 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 36.

Adding to 21444120422244 its reverse (44222402144412), we get a palindrome (65666522566656).

The spelling of 21444120422244 in words is "twenty-one trillion, four hundred forty-four billion, one hundred twenty million, four hundred twenty-two thousand, two hundred forty-four".