12011323220 has 48 divisors (see below), whose sum is σ = 27676630800. Its totient is φ = 4351266816.

The previous prime is 12011323217. The next prime is 12011323229. The reversal of 12011323220 is 2232311021.

It can be written as a sum of positive squares in 8 ways, for example, as 393070276 + 11618252944 = 19826^2 + 107788^2 .

It is a super-2 number, since 2×12011323220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011323229) 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, 422045 + ... + 449604.

It is an arithmetic number, because the mean of its divisors is an integer number (576596475).

Almost surely, 2^12011323220 is an apocalyptic number.

12011323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12011323220 is an abundant number, since it is smaller than the sum of its proper divisors (15665307580).

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

12011323220 is a wasteful number, since it uses less digits than its factorization.

12011323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871724 (or 871722 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 12011323220 its reverse (2232311021), we get a palindrome (14243634241).

The spelling of 12011323220 in words is "twelve billion, eleven million, three hundred twenty-three thousand, two hundred twenty".