21104222123440 has 80 divisors (see below), whose sum is σ = 51146769120480. Its totient is φ = 8088377722880.

The previous prime is 21104222123437. The next prime is 21104222123471. The reversal of 21104222123440 is 4432122240112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 21104222123399 and 21104222123408.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 34416109 + ... + 35023948.

It is an arithmetic number, because the mean of its divisors is an integer number (639334614006).

Almost surely, 2^{21104222123440} is an apocalyptic number.

21104222123440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104222123440 is an abundant number, since it is smaller than the sum of its proper divisors (30042546997040).

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

21104222123440 is a wasteful number, since it uses less digits than its factorization.

21104222123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69440230 (or 69440224 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21104222123440 its reverse (4432122240112), we get a palindrome (25536344363552).

The spelling of 21104222123440 in words is "twenty-one trillion, one hundred four billion, two hundred twenty-two million, one hundred twenty-three thousand, four hundred forty".