1216112212 has 48 divisors (see below), whose sum is σ = 2552239872. Its totient is φ = 495728640.

The previous prime is 1216112207. The next prime is 1216112231. The reversal of 1216112212 is 2122116121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216112212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111348 + ... + 121780.

It is an arithmetic number, because the mean of its divisors is an integer number (53171664).

Almost surely, 2^1216112212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216112212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276119936).

1216112212 is an abundant number, since it is smaller than the sum of its proper divisors (1336127660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216112212 is a wasteful number, since it uses less digits than its factorization.

1216112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10648 (or 10646 counting only the distinct ones).

The product of its digits is 96, while the sum is 19.

The square root of 1216112212 is about 34872.8004611044. The cubic root of 1216112212 is about 1067.3934903524.

Adding to 1216112212 its reverse (2122116121), we get a palindrome (3338228333).

The spelling of 1216112212 in words is "one billion, two hundred sixteen million, one hundred twelve thousand, two hundred twelve".