12123133220 has 48 divisors (see below), whose sum is σ = 28085097600. Its totient is φ = 4358872320.

The previous prime is 12123133153. The next prime is 12123133223. The reversal of 12123133220 is 2233132121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12123133192 and 12123133201.

It is not an unprimeable number, because it can be changed into a prime (12123133223) 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, 290000 + ... + 329159.

It is an arithmetic number, because the mean of its divisors is an integer number (585106200).

Almost surely, 2^12123133220 is an apocalyptic number.

12123133220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123133220 is an abundant number, since it is smaller than the sum of its proper divisors (15961964380).

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

12123133220 is a wasteful number, since it uses less digits than its factorization.

12123133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619268 (or 619266 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12123133220 its reverse (2233132121), we get a palindrome (14356265341).

It can be divided in two parts, 121231 and 33220, that added together give a palindrome (154451).

The spelling of 12123133220 in words is "twelve billion, one hundred twenty-three million, one hundred thirty-three thousand, two hundred twenty".