1211211212 has 12 divisors (see below), whose sum is σ = 2121179760. Its totient is φ = 605159856.

The previous prime is 1211211203. The next prime is 1211211283. The reversal of 1211211212 is 2121121121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105287 + ... + 116222.

It is an arithmetic number, because the mean of its divisors is an integer number (176764980).

Almost surely, 2^1211211212 is an apocalyptic number.

It is an amenable number.

1211211212 is a deficient number, since it is larger than the sum of its proper divisors (909968548).

1211211212 is a wasteful number, since it uses less digits than its factorization.

1211211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222880 (or 222878 counting only the distinct ones).

The product of its digits is 16, while the sum is 14.

The square root of 1211211212 is about 34802.4598555907. The cubic root of 1211211212 is about 1065.9576747284.

Adding to 1211211212 its reverse (2121121121), we get a palindrome (3332332333).

Subtracting 1211211212 from its reverse (2121121121), we obtain a palindrome (909909909).

It can be divided in two parts, 121121121 and 2, that multiplied together give a palindrome (242242242).

The spelling of 1211211212 in words is "one billion, two hundred eleven million, two hundred eleven thousand, two hundred twelve".