21444025020543 has 16 divisors (see below), whose sum is σ = 31774463736160. Its totient is φ = 14293524679488.

The previous prime is 21444025020533. The next prime is 21444025020571. The reversal of 21444025020543 is 34502052044412.

21444025020543 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 40 + 2 + 50 + 20 + 543 = 666.

It is not a de Polignac number, because 21444025020543 - 2⁴ = 21444025020527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21444025020498 and 21444025020507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444025020503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69064480 + ... + 69374277.

It is an arithmetic number, because the mean of its divisors is an integer number (1985903983510).

Almost surely, 2^{21444025020543} is an apocalyptic number.

21444025020543 is a deficient number, since it is larger than the sum of its proper divisors (10330438715617).

21444025020543 is a wasteful number, since it uses less digits than its factorization.

21444025020543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138444503 (or 138444497 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 36.

Adding to 21444025020543 its reverse (34502052044412), we get a palindrome (55946077064955).

The spelling of 21444025020543 in words is "twenty-one trillion, four hundred forty-four billion, twenty-five million, twenty thousand, five hundred forty-three".