21840502108740 has 48 divisors (see below), whose sum is σ = 69889606749312. Its totient is φ = 4992114767616.

The previous prime is 21840502108721. The next prime is 21840502108757. The reversal of 21840502108740 is 4780120504812.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 21840502108692 and 21840502108701.

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, 26000597329 + ... + 26000598168.

It is an arithmetic number, because the mean of its divisors is an integer number (1456033473944).

Almost surely, 2^{21840502108740} is an apocalyptic number.

21840502108740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21840502108740 is an abundant number, since it is smaller than the sum of its proper divisors (48049104640572).

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

21840502108740 is a wasteful number, since it uses less digits than its factorization.

21840502108740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52001195516 (or 52001195514 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The spelling of 21840502108740 in words is "twenty-one trillion, eight hundred forty billion, five hundred two million, one hundred eight thousand, seven hundred forty".