12003126520 has 256 divisors, whose sum is σ = 34488115200. Its totient is φ = 3651648000.

The previous prime is 12003126517. The next prime is 12003126523. The reversal of 12003126520 is 2562130021.

It is an interprime number because it is at equal distance from previous prime (12003126517) and next prime (12003126523).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 12003126491 and 12003126500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12003126523) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28646871 + ... + 28647289.

It is an arithmetic number, because the mean of its divisors is an integer number (134719200).

Almost surely, 2^12003126520 is an apocalyptic number.

12003126520 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 12003126520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17244057600).

12003126520 is an abundant number, since it is smaller than the sum of its proper divisors (22484988680).

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

12003126520 is a wasteful number, since it uses less digits than its factorization.

12003126520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 12003126520 its reverse (2562130021), we get a palindrome (14565256541).

The spelling of 12003126520 in words is "twelve billion, three million, one hundred twenty-six thousand, five hundred twenty".