221355512055 has 12 divisors (see below), whose sum is σ = 383682887640. Its totient is φ = 118056273072.

The previous prime is 221355512047. The next prime is 221355512069. The reversal of 221355512055 is 550215553122.

221355512055 is a `hidden beast` number, since 2 + 2 + 1 + 35 + 551 + 20 + 55 = 666.

221355512055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221355512055 - 2³ = 221355512047 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 11 ways as a sum of consecutive naturals, for example, 2459505645 + ... + 2459505734.

It is an arithmetic number, because the mean of its divisors is an integer number (31973573970).

Almost surely, 2^221355512055 is an apocalyptic number.

221355512055 is a deficient number, since it is larger than the sum of its proper divisors (162327375585).

221355512055 is a wasteful number, since it uses less digits than its factorization.

221355512055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919011390 (or 4919011387 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 221355512055 in words is "two hundred twenty-one billion, three hundred fifty-five million, five hundred twelve thousand, fifty-five".