12111531520 has 160 divisors (see below), whose sum is σ = 32356786176. Its totient is φ = 4310016000.

The previous prime is 12111531511. The next prime is 12111531533. The reversal of 12111531520 is 2513511121.

It is a tau number, because it is divible by the number of its divisors (160).

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 = 12111531491 and 12111531500.

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, 1318945 + ... + 1328095.

Almost surely, 2^12111531520 is an apocalyptic number.

12111531520 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 12111531520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16178393088).

12111531520 is an abundant number, since it is smaller than the sum of its proper divisors (20245254656).

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

12111531520 is an equidigital number, since it uses as much as digits as its factorization.

12111531520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9232 (or 9216 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

The spelling of 12111531520 in words is "twelve billion, one hundred eleven million, five hundred thirty-one thousand, five hundred twenty".