212121212224 has 14 divisors (see below), whose sum is σ = 420928030634. Its totient is φ = 106060606080.

The previous prime is 212121212209. The next prime is 212121212257. The reversal of 212121212224 is 422212121212.

It can be written as a sum of positive squares in only one way, i.e., 147787962624 + 64333249600 = 384432^2 + 253640^2 .

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 212121212195 and 212121212204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1657196907 + ... + 1657197034.

Almost surely, 2^212121212224 is an apocalyptic number.

It is an amenable number.

212121212224 is a deficient number, since it is larger than the sum of its proper divisors (208806818410).

212121212224 is an equidigital number, since it uses as much as digits as its factorization.

212121212224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3314393953 (or 3314393943 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

Adding to 212121212224 its reverse (422212121212), we get a palindrome (634333333436).

The spelling of 212121212224 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-four".