211989228 has 24 divisors (see below), whose sum is σ = 539609280. Its totient is φ = 64239120.

The previous prime is 211989179. The next prime is 211989293. The reversal of 211989228 is 822989112.

211989228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 211989228.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 802858 + ... + 803121.

It is an arithmetic number, because the mean of its divisors is an integer number (22483720).

Almost surely, 2^211989228 is an apocalyptic number.

It is an amenable number.

211989228 is an abundant number, since it is smaller than the sum of its proper divisors (327620052).

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

211989228 is a wasteful number, since it uses less digits than its factorization.

211989228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605997 (or 1605995 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 211989228 is about 14559.8498618633. The cubic root of 211989228 is about 596.2630964604.

The spelling of 211989228 in words is "two hundred eleven million, nine hundred eighty-nine thousand, two hundred twenty-eight".