211971228 has 48 divisors (see below), whose sum is σ = 565985280. Its totient is φ = 60485184.

The previous prime is 211971217. The next prime is 211971229. The reversal of 211971228 is 822179112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211971229) 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 15 ways as a sum of consecutive naturals, for example, 106450 + ... + 108422.

It is an arithmetic number, because the mean of its divisors is an integer number (11791360).

Almost surely, 2^211971228 is an apocalyptic number.

211971228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

211971228 is an abundant number, since it is smaller than the sum of its proper divisors (354014052).

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

211971228 is a wasteful number, since it uses less digits than its factorization.

211971228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266 (or 3264 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The square root of 211971228 is about 14559.2317104990. The cubic root of 211971228 is about 596.2462197546.

The spelling of 211971228 in words is "two hundred eleven million, nine hundred seventy-one thousand, two hundred twenty-eight".