211868550 has 36 divisors (see below), whose sum is σ = 569221380. Its totient is φ = 56498160.

The previous prime is 211868543. The next prime is 211868551. The reversal of 211868550 is 55868112.

211868550 is a `hidden beast` number, since 21 + 1 + 86 + 8 + 550 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211868551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 234960 + ... + 235859.

It is an arithmetic number, because the mean of its divisors is an integer number (15811705).

Almost surely, 2^211868550 is an apocalyptic number.

211868550 is an abundant number, since it is smaller than the sum of its proper divisors (357352830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211868550 is a wasteful number, since it uses less digits than its factorization.

211868550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470837 (or 470829 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 211868550 is about 14555.7050670862. The cubic root of 211868550 is about 596.1499311251.

The spelling of 211868550 in words is "two hundred eleven million, eight hundred sixty-eight thousand, five hundred fifty".