212223220 has 48 divisors (see below), whose sum is σ = 491049216. Its totient is φ = 76400000.

The previous prime is 212223197. The next prime is 212223227. The reversal of 212223220 is 22322212.

It is a junction number, because it is equal to n+sod(n) for n = 212223194 and 212223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212223227) 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, 17445 + ... + 26995.

It is an arithmetic number, because the mean of its divisors is an integer number (10230192).

Almost surely, 2^212223220 is an apocalyptic number.

212223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245524608).

212223220 is an abundant number, since it is smaller than the sum of its proper divisors (278825996).

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

212223220 is a wasteful number, since it uses less digits than its factorization.

212223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9672 (or 9670 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 212223220 is about 14567.8831681202. The cubic root of 212223220 is about 596.4823992575.

Adding to 212223220 its reverse (22322212), we get a palindrome (234545432).

It can be divided in two parts, 21222 and 3220, that added together give a palindrome (24442).

The spelling of 212223220 in words is "two hundred twelve million, two hundred twenty-three thousand, two hundred twenty".