12123400220 has 48 divisors (see below), whose sum is σ = 26344090080. Its totient is φ = 4683334656.

The previous prime is 12123400199. The next prime is 12123400231. The reversal of 12123400220 is 2200432121.

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, 2657 + ... + 155736.

It is an arithmetic number, because the mean of its divisors is an integer number (548835210).

Almost surely, 2^12123400220 is an apocalyptic number.

12123400220 is a gapful number since it is divisible by the number (10) 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 12123400220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13172045040).

12123400220 is an abundant number, since it is smaller than the sum of its proper divisors (14220689860).

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

12123400220 is a wasteful number, since it uses less digits than its factorization.

12123400220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158534 (or 158532 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 12123400220 its reverse (2200432121), we get a palindrome (14323832341).

The spelling of 12123400220 in words is "twelve billion, one hundred twenty-three million, four hundred thousand, two hundred twenty".