12120552500 has 120 divisors (see below), whose sum is σ = 31112040960. Its totient is φ = 4043088000.

The previous prime is 12120552473. The next prime is 12120552511. The reversal of 12120552500 is 525502121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 638141 + ... + 656859.

It is an arithmetic number, because the mean of its divisors is an integer number (259267008).

Almost surely, 2^12120552500 is an apocalyptic number.

12120552500 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 12120552500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15556020480).

12120552500 is an abundant number, since it is smaller than the sum of its proper divisors (18991488460).

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

12120552500 is a wasteful number, since it uses less digits than its factorization.

12120552500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18787 (or 18770 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The spelling of 12120552500 in words is "twelve billion, one hundred twenty million, five hundred fifty-two thousand, five hundred".