1212121211212 has 6 divisors (see below), whose sum is σ = 2121212119628. Its totient is φ = 606060605604.

The previous prime is 1212121211201. The next prime is 1212121211251. The reversal of 1212121211212 is 2121121212121.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1212121211212.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 151515151398 + ... + 151515151405.

Almost surely, 2^{1212121211212} is an apocalyptic number.

It is an amenable number.

1212121211212 is a deficient number, since it is larger than the sum of its proper divisors (909090908416).

1212121211212 is a wasteful number, since it uses less digits than its factorization.

1212121211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303030302807 (or 303030302805 counting only the distinct ones).

The product of its digits is 64, while the sum is 19.

Adding to 1212121211212 its reverse (2121121212121), we get a palindrome (3333242423333).

Subtracting 1212121211212 from its reverse (2121121212121), we obtain a palindrome (909000000909).

The spelling of 1212121211212 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twelve".