1212221212 has 6 divisors (see below), whose sum is σ = 2121387128. Its totient is φ = 606110604.

The previous prime is 1212221191. The next prime is 1212221221. The reversal of 1212221212 is 2121222121.

It is a happy number.

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

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, 151527648 + ... + 151527655.

Almost surely, 2^1212221212 is an apocalyptic number.

It is an amenable number.

1212221212 is a deficient number, since it is larger than the sum of its proper divisors (909165916).

1212221212 is a wasteful number, since it uses less digits than its factorization.

1212221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303055307 (or 303055305 counting only the distinct ones).

The product of its digits is 64, while the sum is 16.

The square root of 1212221212 is about 34816.9673004413. The cubic root of 1212221212 is about 1066.2538845951.

Adding to 1212221212 its reverse (2121222121), we get a palindrome (3333443333).

Subtracting 1212221212 from its reverse (2121222121), we obtain a palindrome (909000909).

It can be divided in two parts, 121222121 and 2, that multiplied together give a palindrome (242444242).

The spelling of 1212221212 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twelve".