212540166 has 32 divisors (see below), whose sum is σ = 473484000. Its totient is φ = 70670880.

The previous prime is 212540143. The next prime is 212540177. The reversal of 212540166 is 661045212.

212540166 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18060 + ... + 27408.

It is an arithmetic number, because the mean of its divisors is an integer number (14796375).

Almost surely, 2^212540166 is an apocalyptic number.

212540166 is an abundant number, since it is smaller than the sum of its proper divisors (260943834).

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

212540166 is a wasteful number, since it uses less digits than its factorization.

212540166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9781 (or 9775 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 212540166 is about 14578.7573544524. The cubic root of 212540166 is about 596.7791915918.

Adding to 212540166 its reverse (661045212), we get a palindrome (873585378).

The spelling of 212540166 in words is "two hundred twelve million, five hundred forty thousand, one hundred sixty-six".