12011022520 has 128 divisors (see below), whose sum is σ = 32656320000. Its totient is φ = 3883894272.

The previous prime is 12011022497. The next prime is 12011022521. The reversal of 12011022520 is 2522011021.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12011022494 and 12011022503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011022521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1213351 + ... + 1223209.

It is an arithmetic number, because the mean of its divisors is an integer number (255127500).

Almost surely, 2^12011022520 is an apocalyptic number.

12011022520 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 12011022520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16328160000).

12011022520 is an abundant number, since it is smaller than the sum of its proper divisors (20645297480).

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

12011022520 is a wasteful number, since it uses less digits than its factorization.

12011022520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10125 (or 10121 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 12011022520 its reverse (2522011021), we get a palindrome (14533033541).

The spelling of 12011022520 in words is "twelve billion, eleven million, twenty-two thousand, five hundred twenty".