12021111312 has 40 divisors (see below), whose sum is σ = 35490901056. Its totient is φ = 3434603136.

The previous prime is 12021111293. The next prime is 12021111341. The reversal of 12021111312 is 21311112021.

It is a super-2 number, since 2×12021111312² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12021111291 and 12021111300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17888223 + ... + 17888894.

Almost surely, 2^12021111312 is an apocalyptic number.

12021111312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12021111312 is an abundant number, since it is smaller than the sum of its proper divisors (23469789744).

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

12021111312 is a wasteful number, since it uses less digits than its factorization.

12021111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35777135 (or 35777129 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12021111312 its reverse (21311112021), we get a palindrome (33332223333).

The spelling of 12021111312 in words is "twelve billion, twenty-one million, one hundred eleven thousand, three hundred twelve".