12013123220 has 72 divisors (see below), whose sum is σ = 29364698664. Its totient is φ = 4116209664.

The previous prime is 12013123211. The next prime is 12013123351. The reversal of 12013123220 is 2232131021.

It can be written as a sum of positive squares in 4 ways, for example, as 6534458896 + 5478664324 = 80836^2 + 74018^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2224844 + ... + 2230236.

It is an arithmetic number, because the mean of its divisors is an integer number (407843037).

Almost surely, 2^12013123220 is an apocalyptic number.

12013123220 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 12013123220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14682349332).

12013123220 is an abundant number, since it is smaller than the sum of its proper divisors (17351575444).

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

12013123220 is a wasteful number, since it uses less digits than its factorization.

12013123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7689 (or 7680 counting only the distinct ones).

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

Adding to 12013123220 its reverse (2232131021), we get a palindrome (14245254241).

The spelling of 12013123220 in words is "twelve billion, thirteen million, one hundred twenty-three thousand, two hundred twenty".