11212121201212 has 12 divisors (see below), whose sum is σ = 19622455084120. Its totient is φ = 5605705462896.

The previous prime is 11212121201209. The next prime is 11212121201227. The reversal of 11212121201212 is 21210212121211.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 11212121201212.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 88713387 + ... + 88839682.

Almost surely, 2^{11212121201212} is an apocalyptic number.

It is an amenable number.

11212121201212 is a deficient number, since it is larger than the sum of its proper divisors (8410333882908).

11212121201212 is a wasteful number, since it uses less digits than its factorization.

11212121201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177568860 (or 177568858 counting only the distinct ones).

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

Adding to 11212121201212 its reverse (21210212121211), we get a palindrome (32422333322423).

The spelling of 11212121201212 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred one thousand, two hundred twelve".