243021222 has 80 divisors (see below), whose sum is σ = 584400960. Its totient is φ = 75209472.

The previous prime is 243021211. The next prime is 243021223. The reversal of 243021222 is 222120342.

243021222 is a `hidden beast` number, since 2 + 430 + 212 + 22 = 666.

243021222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 243021195 and 243021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243021223) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 217008 + ... + 218124.

It is an arithmetic number, because the mean of its divisors is an integer number (7305012).

Almost surely, 2^243021222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243021222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292200480).

243021222 is an abundant number, since it is smaller than the sum of its proper divisors (341379738).

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

243021222 is a wasteful number, since it uses less digits than its factorization.

243021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 243021222 is about 15589.1379492261. The cubic root of 243021222 is about 624.0433124522.

Adding to 243021222 its reverse (222120342), we get a palindrome (465141564).

The spelling of 243021222 in words is "two hundred forty-three million, twenty-one thousand, two hundred twenty-two".