12120540500 has 24 divisors (see below), whose sum is σ = 26471261544. Its totient is φ = 4848216000.

The previous prime is 12120540469. The next prime is 12120540503. The reversal of 12120540500 is 504502121.

It can be written as a sum of positive squares in 4 ways, for example, as 133356304 + 11987184196 = 11548^2 + 109486^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120540503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12120041 + ... + 12121040.

It is an arithmetic number, because the mean of its divisors is an integer number (1102969231).

Almost surely, 2^12120540500 is an apocalyptic number.

12120540500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12120540500 is an abundant number, since it is smaller than the sum of its proper divisors (14350721044).

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

12120540500 is a wasteful number, since it uses less digits than its factorization.

12120540500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24241100 (or 24241088 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 12120540500 in words is "twelve billion, one hundred twenty million, five hundred forty thousand, five hundred".