1213133312 has 40 divisors (see below), whose sum is σ = 2453186736. Its totient is φ = 599237632.

The previous prime is 1213133303. The next prime is 1213133333. The reversal of 1213133312 is 2133313121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28223 + ... + 56769.

Almost surely, 2^1213133312 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 1213133312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226593368).

1213133312 is an abundant number, since it is smaller than the sum of its proper divisors (1240053424).

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

1213133312 is an frugal number, since it uses more digits than its factorization.

1213133312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28648 (or 28632 counting only the distinct ones).

The product of its digits is 324, while the sum is 20.

The square root of 1213133312 is about 34830.0633361468. The cubic root of 1213133312 is about 1066.5212412853.

Adding to 1213133312 its reverse (2133313121), we get a palindrome (3346446433).

The spelling of 1213133312 in words is "one billion, two hundred thirteen million, one hundred thirty-three thousand, three hundred twelve".