1212311212 has 48 divisors (see below), whose sum is σ = 2495164672. Its totient is φ = 504584640.

The previous prime is 1212311161. The next prime is 1212311213. The reversal of 1212311212 is 2121132121.

It is not an unprimeable number, because it can be changed into a prime (1212311213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215143 + ... + 220705.

Almost surely, 2^1212311212 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 1212311212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1247582336).

1212311212 is an abundant number, since it is smaller than the sum of its proper divisors (1282853460).

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

1212311212 is a wasteful number, since it uses less digits than its factorization.

1212311212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5798 (or 5796 counting only the distinct ones).

The product of its digits is 48, while the sum is 16.

The square root of 1212311212 is about 34818.2597497348. The cubic root of 1212311212 is about 1066.2802715488.

Adding to 1212311212 its reverse (2121132121), we get a palindrome (3333443333).

The spelling of 1212311212 in words is "one billion, two hundred twelve million, three hundred eleven thousand, two hundred twelve".