12011331220 has 48 divisors (see below), whose sum is σ = 28841823360. Its totient is φ = 4116081024.

The previous prime is 12011331203. The next prime is 12011331281. The reversal of 12011331220 is 2213311021.

It is a junction number, because it is equal to n+sod(n) for n = 12011331194 and 12011331203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268927 + ... + 310393.

It is an arithmetic number, because the mean of its divisors is an integer number (600871320).

Almost surely, 2^12011331220 is an apocalyptic number.

12011331220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12011331220 is an abundant number, since it is smaller than the sum of its proper divisors (16830492140).

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

12011331220 is a wasteful number, since it uses less digits than its factorization.

12011331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43552 (or 43550 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12011331220 its reverse (2213311021), we get a palindrome (14224642241).

The spelling of 12011331220 in words is "twelve billion, eleven million, three hundred thirty-one thousand, two hundred twenty".