211224220 has 12 divisors (see below), whose sum is σ = 443570904. Its totient is φ = 84489680.

The previous prime is 211224217. The next prime is 211224227. The reversal of 211224220 is 22422112.

It is a super-2 number, since 2×211224220² = 89231342229216800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211224194 and 211224203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211224227) 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 3 ways as a sum of consecutive naturals, for example, 5280586 + ... + 5280625.

It is an arithmetic number, because the mean of its divisors is an integer number (36964242).

Almost surely, 2^211224220 is an apocalyptic number.

211224220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211224220 is an abundant number, since it is smaller than the sum of its proper divisors (232346684).

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

211224220 is a wasteful number, since it uses less digits than its factorization.

211224220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561220 (or 10561218 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 211224220 is about 14533.5549677290. The cubic root of 211224220 is about 595.5449847498.

Adding to 211224220 its reverse (22422112), we get a palindrome (233646332).

The spelling of 211224220 in words is "two hundred eleven million, two hundred twenty-four thousand, two hundred twenty".