9866213200 has 120 divisors (see below), whose sum is σ = 24323755680. Its totient is φ = 3844492800.

The previous prime is 9866213197. The next prime is 9866213209. The reversal of 9866213200 is 23126689.

It is a self number, because there is not a number n which added to its sum of digits gives 9866213200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9866213209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2608911 + ... + 2612689.

It is an arithmetic number, because the mean of its divisors is an integer number (202697964).

Almost surely, 2^9866213200 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 9866213200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12161877840).

9866213200 is an abundant number, since it is smaller than the sum of its proper divisors (14457542480).

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

9866213200 is a wasteful number, since it uses less digits than its factorization.

9866213200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965 (or 3954 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 9866213200 is about 99328.8135437044. The cubic root of 9866213200 is about 2144.7836912369.

Adding to 9866213200 its reverse (23126689), we get a palindrome (9889339889).

The spelling of 9866213200 in words is "nine billion, eight hundred sixty-six million, two hundred thirteen thousand, two hundred".