21365450005540 has 12 divisors (see below), whose sum is σ = 44867445011676. Its totient is φ = 8546180002208.

The previous prime is 21365450005517. The next prime is 21365450005567. The reversal of 21365450005540 is 4550005456312.

21365450005540 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2826776415204 + 18538673590336 = 1681302^2 + 4305656^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21365450005493 and 21365450005502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534136250119 + ... + 534136250158.

It is an arithmetic number, because the mean of its divisors is an integer number (3738953750973).

Almost surely, 2^{21365450005540} is an apocalyptic number.

21365450005540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21365450005540 is an abundant number, since it is smaller than the sum of its proper divisors (23501995006136).

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

21365450005540 is a wasteful number, since it uses less digits than its factorization.

21365450005540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068272500286 (or 1068272500284 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 21365450005540 in words is "twenty-one trillion, three hundred sixty-five billion, four hundred fifty million, five thousand, five hundred forty".