21445140144 has 80 divisors (see below), whose sum is σ = 58902703200. Its totient is φ = 6699909120.

The previous prime is 21445140121. The next prime is 21445140179. The reversal of 21445140144 is 44104154412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142132 + ... + 251180.

It is an arithmetic number, because the mean of its divisors is an integer number (736283790).

Almost surely, 2^21445140144 is an apocalyptic number.

21445140144 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 21445140144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29451351600).

21445140144 is an abundant number, since it is smaller than the sum of its proper divisors (37457563056).

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

21445140144 is a wasteful number, since it uses less digits than its factorization.

21445140144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109318 (or 109312 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 30.

Adding to 21445140144 its reverse (44104154412), we get a palindrome (65549294556).

The spelling of 21445140144 in words is "twenty-one billion, four hundred forty-five million, one hundred forty thousand, one hundred forty-four".