2120500000 has 84 divisors (see below), whose sum is σ = 5219581626. Its totient is φ = 848000000.

The previous prime is 2120499991. The next prime is 2120500069. The reversal of 2120500000 is 50212.

It can be written as a sum of positive squares in 7 ways, for example, as 464661136 + 1655838864 = 21556^2 + 40692^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 2120500000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 497880 + ... + 502120.

Almost surely, 2^2120500000 is an apocalyptic number.

2120500000 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 2120500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2609790813).

2120500000 is an abundant number, since it is smaller than the sum of its proper divisors (3099081626).

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

2120500000 is an frugal number, since it uses more digits than its factorization.

2120500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4281 (or 4248 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 2120500000 is about 46048.8870658130. The cubic root of 2120500000 is about 1284.7326428287.

Adding to 2120500000 its reverse (50212), we get a palindrome (2120550212).

The spelling of 2120500000 in words is "two billion, one hundred twenty million, five hundred thousand".