243212112 has 320 divisors, whose sum is σ = 853278720. Its totient is φ = 65318400.

The previous prime is 243212107. The next prime is 243212117. The reversal of 243212112 is 211212342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243212107) and next prime (243212117).

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

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 (243212117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1914993 + ... + 1915119.

It is an arithmetic number, because the mean of its divisors is an integer number (2666496).

Almost surely, 2^243212112 is an apocalyptic number.

243212112 is a gapful number since it is divisible by the number (22) 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 243212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (426639360).

243212112 is an abundant number, since it is smaller than the sum of its proper divisors (610066608).

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

243212112 is a wasteful number, since it uses less digits than its factorization.

243212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 187 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 243212112 is about 15595.2592796657. The cubic root of 243212112 is about 624.2066623173.

Adding to 243212112 its reverse (211212342), we get a palindrome (454424454).

The spelling of 243212112 in words is "two hundred forty-three million, two hundred twelve thousand, one hundred twelve".