2171202180 has 192 divisors, whose sum is σ = 7367442432. Its totient is φ = 467182080.

The previous prime is 2171202179. The next prime is 2171202193. The reversal of 2171202180 is 812021712.

It is a self number, because there is not a number n which added to its sum of digits gives 2171202180.

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 63 ways as a sum of consecutive naturals, for example, 479487 + ... + 483993.

It is an arithmetic number, because the mean of its divisors is an integer number (38372096).

Almost surely, 2^2171202180 is an apocalyptic number.

2171202180 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 2171202180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3683721216).

2171202180 is an abundant number, since it is smaller than the sum of its proper divisors (5196240252).

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

2171202180 is a wasteful number, since it uses less digits than its factorization.

2171202180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594 (or 4592 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 2171202180 is about 46596.1605714462. The cubic root of 2171202180 is about 1294.8916254224.

Adding to 2171202180 its reverse (812021712), we get a palindrome (2983223892).

The spelling of 2171202180 in words is "two billion, one hundred seventy-one million, two hundred two thousand, one hundred eighty".