2112540500 has 96 divisors (see below), whose sum is σ = 5294365440. Its totient is φ = 721353600.

The previous prime is 2112540449. The next prime is 2112540509. The reversal of 2112540500 is 50452112.

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 (2112540509) 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, 968411 + ... + 970589.

It is an arithmetic number, because the mean of its divisors is an integer number (55149640).

Almost surely, 2^2112540500 is an apocalyptic number.

2112540500 is a gapful number since it is divisible by the number (20) 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 2112540500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2647182720).

2112540500 is an abundant number, since it is smaller than the sum of its proper divisors (3181824940).

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

2112540500 is a wasteful number, since it uses less digits than its factorization.

2112540500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482 (or 2470 counting only the distinct ones).

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

The square root of 2112540500 is about 45962.3813569315. The cubic root of 2112540500 is about 1283.1231716722.

Adding to 2112540500 its reverse (50452112), we get a palindrome (2162992612).

It can be divided in two parts, 21125 and 40500, that multiplied together give a square (855562500 = 29250²).

The spelling of 2112540500 in words is "two billion, one hundred twelve million, five hundred forty thousand, five hundred".