12011220312 has 128 divisors (see below), whose sum is σ = 37956710400. Its totient is φ = 3082157568.

The previous prime is 12011220301. The next prime is 12011220359. The reversal of 12011220312 is 21302211021.

It is a junction number, because it is equal to n+sod(n) for n = 12011220291 and 12011220300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6489 + ... + 155127.

It is an arithmetic number, because the mean of its divisors is an integer number (296536800).

Almost surely, 2^12011220312 is an apocalyptic number.

12011220312 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 12011220312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18978355200).

12011220312 is an abundant number, since it is smaller than the sum of its proper divisors (25945490088).

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

12011220312 is a wasteful number, since it uses less digits than its factorization.

12011220312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148705 (or 148701 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12011220312 its reverse (21302211021), we get a palindrome (33313431333).

The spelling of 12011220312 in words is "twelve billion, eleven million, two hundred twenty thousand, three hundred twelve".