211533228 has 24 divisors (see below), whose sum is σ = 548419760. Its totient is φ = 70511040.

The previous prime is 211533209. The next prime is 211533233. The reversal of 211533228 is 822335112.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 979213 + ... + 979428.

Almost surely, 2^211533228 is an apocalyptic number.

It is an amenable number.

211533228 is an abundant number, since it is smaller than the sum of its proper divisors (336886532).

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

211533228 is a wasteful number, since it uses less digits than its factorization.

211533228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958654 (or 1958646 counting only the distinct ones).

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

The square root of 211533228 is about 14544.1819295552. The cubic root of 211533228 is about 595.8352584329.

The spelling of 211533228 in words is "two hundred eleven million, five hundred thirty-three thousand, two hundred twenty-eight".