211228 has 6 divisors (see below), whose sum is σ = 369656. Its totient is φ = 105612.

The previous prime is 211219. The next prime is 211229. The reversal of 211228 is 822112.

211228 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211229) by changing a digit.

211228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26400 + ... + 26407.

2²¹¹²²⁸ is an apocalyptic number.

It is an amenable number.

211228 is a deficient number, since it is larger than the sum of its proper divisors (158428).

211228 is a wasteful number, since it uses less digits than its factorization.

211228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52811 (or 52809 counting only the distinct ones).

The product of its digits is 64, while the sum is 16.

The square root of 211228 is about 459.5954743032. The cubic root of 211228 is about 59.5548537288.

The spelling of 211228 in words is "two hundred eleven thousand, two hundred twenty-eight".