21544452055155 has 32 divisors (see below), whose sum is σ = 34808980414464. Its totient is φ = 11378101383936.

The previous prime is 21544452055153. The next prime is 21544452055163. The reversal of 21544452055155 is 55155025444512.

It is a happy number.

21544452055155 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 21544452055155 - 2¹ = 21544452055153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21544452055151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9815754 + ... + 11808383.

It is an arithmetic number, because the mean of its divisors is an integer number (1087780637952).

Almost surely, 2^{21544452055155} is an apocalyptic number.

21544452055155 is a deficient number, since it is larger than the sum of its proper divisors (13264528359309).

21544452055155 is a wasteful number, since it uses less digits than its factorization.

21544452055155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21624795.

The product of its (nonzero) digits is 4000000, while the sum is 48.

Adding to 21544452055155 its reverse (55155025444512), we get a palindrome (76699477499667).

The spelling of 21544452055155 in words is "twenty-one trillion, five hundred forty-four billion, four hundred fifty-two million, fifty-five thousand, one hundred fifty-five".