21444240120 has 128 divisors (see below), whose sum is σ = 65588927040. Its totient is φ = 5607383040.

The previous prime is 21444240107. The next prime is 21444240131. The reversal of 21444240120 is 2104244412.

It is a super-2 number, since 2×21444240120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2462494 + ... + 2471186.

Almost surely, 2^21444240120 is an apocalyptic number.

21444240120 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 21444240120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32794463520).

21444240120 is an abundant number, since it is smaller than the sum of its proper divisors (44144686920).

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

21444240120 is a wasteful number, since it uses less digits than its factorization.

21444240120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9105 (or 9101 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21444240120 its reverse (2104244412), we get a palindrome (23548484532).

The spelling of 21444240120 in words is "twenty-one billion, four hundred forty-four million, two hundred forty thousand, one hundred twenty".