211224212 has 24 divisors (see below), whose sum is σ = 376533192. Its totient is φ = 103651200.

The previous prime is 211224199. The next prime is 211224217. The reversal of 211224212 is 212422112.

It can be written as a sum of positive squares in 4 ways, for example, as 78605956 + 132618256 = 8866^2 + 11516^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211224217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178262 + ... + 179442.

It is an arithmetic number, because the mean of its divisors is an integer number (15688883).

Almost surely, 2^211224212 is an apocalyptic number.

It is an amenable number.

211224212 is a deficient number, since it is larger than the sum of its proper divisors (165308980).

211224212 is a wasteful number, since it uses less digits than its factorization.

211224212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979 (or 1977 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 211224212 is about 14533.5546925038. The cubic root of 211224212 is about 595.5449772312.

Adding to 211224212 its reverse (212422112), we get a palindrome (423646324).

The spelling of 211224212 in words is "two hundred eleven million, two hundred twenty-four thousand, two hundred twelve".