12243120520 has 64 divisors (see below), whose sum is σ = 29239412400. Its totient is φ = 4597800960.

The previous prime is 12243120493. The next prime is 12243120523. The reversal of 12243120520 is 2502134221.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9323447364 + 2919673156 = 96558^2 + 54034^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12243120491 and 12243120500.

It is not an unprimeable number, because it can be changed into a prime (12243120523) 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, 256110 + ... + 300130.

Almost surely, 2^12243120520 is an apocalyptic number.

12243120520 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 12243120520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14619706200).

12243120520 is an abundant number, since it is smaller than the sum of its proper divisors (16996291880).

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

12243120520 is a wasteful number, since it uses less digits than its factorization.

12243120520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44458 (or 44454 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 12243120520 its reverse (2502134221), we get a palindrome (14745254741).

The spelling of 12243120520 in words is "twelve billion, two hundred forty-three million, one hundred twenty thousand, five hundred twenty".