221700055550 has 24 divisors (see below), whose sum is σ = 430290892656. Its totient is φ = 84824368640.

The previous prime is 221700055523. The next prime is 221700055553. The reversal of 221700055550 is 55550007122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221700055553) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 96390179 + ... + 96392478.

It is an arithmetic number, because the mean of its divisors is an integer number (17928787194).

Almost surely, 2^221700055550 is an apocalyptic number.

221700055550 is a deficient number, since it is larger than the sum of its proper divisors (208590837106).

221700055550 is a wasteful number, since it uses less digits than its factorization.

221700055550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192782692 (or 192782687 counting only the distinct ones).

The product of its (nonzero) digits is 17500, while the sum is 32.

The spelling of 221700055550 in words is "two hundred twenty-one billion, seven hundred million, fifty-five thousand, five hundred fifty".