212621166 has 32 divisors (see below), whose sum is σ = 485266080. Its totient is φ = 68957568.

The previous prime is 212621161. The next prime is 212621209. The reversal of 212621166 is 661126212.

212621166 is a `hidden beast` number, since 21 + 2 + 621 + 16 + 6 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212621161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51211 + ... + 55206.

It is an arithmetic number, because the mean of its divisors is an integer number (15164565).

Almost surely, 2^212621166 is an apocalyptic number.

212621166 is an abundant number, since it is smaller than the sum of its proper divisors (272644914).

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

212621166 is a wasteful number, since it uses less digits than its factorization.

212621166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106465 (or 106459 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 212621166 is about 14581.5351043709. The cubic root of 212621166 is about 596.8549936954.

Adding to 212621166 its reverse (661126212), we get a palindrome (873747378).

The spelling of 212621166 in words is "two hundred twelve million, six hundred twenty-one thousand, one hundred sixty-six".