2129500000 has 84 divisors (see below), whose sum is σ = 5241729780. Its totient is φ = 851600000.

The previous prime is 2129499997. The next prime is 2129500007. The reversal of 2129500000 is 59212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129500007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 497871 + ... + 502129.

It is an arithmetic number, because the mean of its divisors is an integer number (62401545).

Almost surely, 2^2129500000 is an apocalyptic number.

2129500000 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 2129500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2620864890).

2129500000 is an abundant number, since it is smaller than the sum of its proper divisors (3112229780).

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

2129500000 is an frugal number, since it uses more digits than its factorization.

2129500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4299 (or 4266 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 2129500000 is about 46146.5058265520. The cubic root of 2129500000 is about 1286.5476666352.

Adding to 2129500000 its reverse (59212), we get a palindrome (2129559212).

The spelling of 2129500000 in words is "two billion, one hundred twenty-nine million, five hundred thousand".