21440110650560 has 112 divisors (see below), whose sum is σ = 58363266519360. Its totient is φ = 7348937687040.

The previous prime is 21440110650503. The next prime is 21440110650571. The reversal of 21440110650560 is 6505601104412.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21440110650560.

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, 7152176 + ... + 9697104.

Almost surely, 2^{21440110650560} is an apocalyptic number.

21440110650560 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 21440110650560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29181633259680).

21440110650560 is an abundant number, since it is smaller than the sum of its proper divisors (36923155868800).

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

21440110650560 is a wasteful number, since it uses less digits than its factorization.

21440110650560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548714 (or 2548704 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 21440110650560 its reverse (6505601104412), we get a palindrome (27945711754972).

The spelling of 21440110650560 in words is "twenty-one trillion, four hundred forty billion, one hundred ten million, six hundred fifty thousand, five hundred sixty".