21444033054555 has 16 divisors (see below), whose sum is σ = 38122725430560. Its totient is φ = 11436817629024.

The previous prime is 21444033054533. The next prime is 21444033054607. The reversal of 21444033054555 is 55545033044412.

21444033054555 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 40 + 3 + 3 + 0 + 54 + 555 = 666.

It is not a de Polignac number, because 21444033054555 - 2⁹ = 21444033054043 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 21444033054555.

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, 79422344512 + ... + 79422344781.

It is an arithmetic number, because the mean of its divisors is an integer number (2382670339410).

Almost surely, 2^{21444033054555} is an apocalyptic number.

21444033054555 is a deficient number, since it is larger than the sum of its proper divisors (16678692376005).

21444033054555 is a wasteful number, since it uses less digits than its factorization.

21444033054555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158844689307 (or 158844689301 counting only the distinct ones).

The product of its (nonzero) digits is 2880000, while the sum is 45.

Adding to 21444033054555 its reverse (55545033044412), we get a palindrome (76989066098967).

The spelling of 21444033054555 in words is "twenty-one trillion, four hundred forty-four billion, thirty-three million, fifty-four thousand, five hundred fifty-five".