212212224 has 400 divisors, whose sum is σ = 784289088. Its totient is φ = 55738368.

The previous prime is 212212219. The next prime is 212212243. The reversal of 212212224 is 422212212.

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 and also a Zuckerman number because it is divisible by the product of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 212212197 and 212212206.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4935147 + ... + 4935189.

Almost surely, 2^212212224 is an apocalyptic number.

212212224 is a gapful number since it is divisible by the number (24) 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 212212224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392144544).

212212224 is an abundant number, since it is smaller than the sum of its proper divisors (572076864).

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

212212224 is an equidigital number, since it uses as much as digits as its factorization.

212212224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 72 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 212212224 is about 14567.5057576786. The cubic root of 212212224 is about 596.4720971587.

Adding to 212212224 its reverse (422212212), we get a palindrome (634424436).

The spelling of 212212224 in words is "two hundred twelve million, two hundred twelve thousand, two hundred twenty-four".