212118228 has 72 divisors (see below), whose sum is σ = 622876800. Its totient is φ = 59607360.

The previous prime is 212118227. The next prime is 212118253. The reversal of 212118228 is 822811212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212118227) 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 23 ways as a sum of consecutive naturals, for example, 8473 + ... + 22271.

Almost surely, 2^212118228 is an apocalyptic number.

212118228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212118228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311438400).

212118228 is an abundant number, since it is smaller than the sum of its proper divisors (410758572).

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

212118228 is a wasteful number, since it uses less digits than its factorization.

212118228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13877 (or 13872 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 212118228 is about 14564.2791788677. The cubic root of 212118228 is about 596.3840182377.

The spelling of 212118228 in words is "two hundred twelve million, one hundred eighteen thousand, two hundred twenty-eight".