21444341412 has 96 divisors (see below), whose sum is σ = 57284277120. Its totient is φ = 6189004800.

The previous prime is 21444341411. The next prime is 21444341417. The reversal of 21444341412 is 21414344412.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21444341412.

It is not an unprimeable number, because it can be changed into a prime (21444341411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263548 + ... + 335180.

It is an arithmetic number, because the mean of its divisors is an integer number (596711220).

Almost surely, 2^21444341412 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 21444341412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28642138560).

21444341412 is an abundant number, since it is smaller than the sum of its proper divisors (35839935708).

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

21444341412 is a wasteful number, since it uses less digits than its factorization.

21444341412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71773 (or 71771 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

Adding to 21444341412 its reverse (21414344412), we get a palindrome (42858685824).

The spelling of 21444341412 in words is "twenty-one billion, four hundred forty-four million, three hundred forty-one thousand, four hundred twelve".