21444877844412 has 96 divisors (see below), whose sum is σ = 55285396992000. Its totient is φ = 6415669536000.

The previous prime is 21444877844381. The next prime is 21444877844417.

21444877844412 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444877844417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2348389 + ... + 6957347.

It is an arithmetic number, because the mean of its divisors is an integer number (575889552000).

Almost surely, 2^{21444877844412} is an apocalyptic number.

21444877844412 is a gapful number since it is divisible by the number (22) 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 21444877844412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27642698496000).

21444877844412 is an abundant number, since it is smaller than the sum of its proper divisors (33840519147588).

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

21444877844412 is a wasteful number, since it uses less digits than its factorization.

21444877844412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609427 (or 4609425 counting only the distinct ones).

The product of its digits is 51380224, while the sum is 60.

It can be divided in two parts, 2144487 and 7844412, that added together give a palindrome (9988899).

The spelling of 21444877844412 in words is "twenty-one trillion, four hundred forty-four billion, eight hundred seventy-seven million, eight hundred forty-four thousand, four hundred twelve".