21115353244055 has 16 divisors (see below), whose sum is σ = 29169572454720. Its totient is φ = 14373412507392.

The previous prime is 21115353244043. The next prime is 21115353244061. The reversal of 21115353244055 is 55044235351112.

It is a cyclic number.

It is not a de Polignac number, because 21115353244055 - 2²⁰ = 21115352195479 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2201804720 + ... + 2201814309.

It is an arithmetic number, because the mean of its divisors is an integer number (1823098278420).

Almost surely, 2^{21115353244055} is an apocalyptic number.

21115353244055 is a deficient number, since it is larger than the sum of its proper divisors (8054219210665).

21115353244055 is a wasteful number, since it uses less digits than its factorization.

21115353244055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403619178.

The product of its (nonzero) digits is 360000, while the sum is 41.

Adding to 21115353244055 its reverse (55044235351112), we get a palindrome (76159588595167).

The spelling of 21115353244055 in words is "twenty-one trillion, one hundred fifteen billion, three hundred fifty-three million, two hundred forty-four thousand, fifty-five".