12155521120 has 24 divisors (see below), whose sum is σ = 28717419024. Its totient is φ = 4862208384.

The previous prime is 12155521117. The next prime is 12155521139. The reversal of 12155521120 is 2112555121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37985844 + ... + 37986163.

It is an arithmetic number, because the mean of its divisors is an integer number (1196559126).

Almost surely, 2^12155521120 is an apocalyptic number.

12155521120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155521120 is an abundant number, since it is smaller than the sum of its proper divisors (16561897904).

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

12155521120 is an equidigital number, since it uses as much as digits as its factorization.

12155521120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75972022 (or 75972014 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 25.

The spelling of 12155521120 in words is "twelve billion, one hundred fifty-five million, five hundred twenty-one thousand, one hundred twenty".