9821940180 has 192 divisors, whose sum is σ = 32182886400. Its totient is φ = 2216471040.

The previous prime is 9821940169. The next prime is 9821940181. The reversal of 9821940180 is 810491289.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9821940181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 448731 + ... + 470109.

It is an arithmetic number, because the mean of its divisors is an integer number (167619200).

Almost surely, 2^9821940180 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9821940180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16091443200).

9821940180 is an abundant number, since it is smaller than the sum of its proper divisors (22360946220).

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

9821940180 is a wasteful number, since it uses less digits than its factorization.

9821940180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21454 (or 21452 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 9821940180 is about 99105.7020559362. The cubic root of 9821940180 is about 2141.5707584486.

The spelling of 9821940180 in words is "nine billion, eight hundred twenty-one million, nine hundred forty thousand, one hundred eighty".