1123212312 has 64 divisors (see below), whose sum is σ = 3133125600. Its totient is φ = 372833280.

The previous prime is 1123212271. The next prime is 1123212313. The reversal of 1123212312 is 2132123211.

1123212312 is a `hidden beast` number, since 112 + 321 + 231 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123212313) 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, 41268 + ... + 62844.

Almost surely, 2^1123212312 is an apocalyptic number.

1123212312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1123212312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566562800).

1123212312 is an abundant number, since it is smaller than the sum of its proper divisors (2009913288).

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

1123212312 is a wasteful number, since it uses less digits than its factorization.

1123212312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21833 (or 21823 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1123212312 is about 33514.3597880073. The cubic root of 1123212312 is about 1039.4907245205.

Adding to 1123212312 its reverse (2132123211), we get a palindrome (3255335523).

The spelling of 1123212312 in words is "one billion, one hundred twenty-three million, two hundred twelve thousand, three hundred twelve".