2171502500 has 60 divisors (see below), whose sum is σ = 4767770700. Its totient is φ = 865104000.

The previous prime is 2171502499. The next prime is 2171502511. The reversal of 2171502500 is 52051712.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 2131484224 + 40018276 = 46168^2 + 6326^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 670886 + ... + 674114.

It is an arithmetic number, because the mean of its divisors is an integer number (79462845).

Almost surely, 2^2171502500 is an apocalyptic number.

2171502500 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 2171502500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2383885350).

2171502500 is an abundant number, since it is smaller than the sum of its proper divisors (2596268200).

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

2171502500 is a wasteful number, since it uses less digits than its factorization.

2171502500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3522 (or 3505 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 2171502500 is about 46599.3830431262. The cubic root of 2171502500 is about 1294.9513256701.

The spelling of 2171502500 in words is "two billion, one hundred seventy-one million, five hundred two thousand, five hundred".