21544144430355 has 48 divisors (see below), whose sum is σ = 38433662991360. Its totient is φ = 11159371028544.

The previous prime is 21544144430311. The next prime is 21544144430383. The reversal of 21544144430355 is 55303444144512.

21544144430355 is a `hidden beast` number, since 2 + 1 + 5 + 44 + 144 + 430 + 35 + 5 = 666.

It is not a de Polignac number, because 21544144430355 - 2¹¹ = 21544144428307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21544144430355.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48662499 + ... + 49103228.

It is an arithmetic number, because the mean of its divisors is an integer number (800701312320).

Almost surely, 2^{21544144430355} is an apocalyptic number.

21544144430355 is a deficient number, since it is larger than the sum of its proper divisors (16889518561005).

21544144430355 is a wasteful number, since it uses less digits than its factorization.

21544144430355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97765880 (or 97765877 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 45.

Adding to 21544144430355 its reverse (55303444144512), we get a palindrome (76847588574867).

The spelling of 21544144430355 in words is "twenty-one trillion, five hundred forty-four billion, one hundred forty-four million, four hundred thirty thousand, three hundred fifty-five".