21189864300 has 144 divisors (see below), whose sum is σ = 66981129600. Its totient is φ = 5129395200.

The previous prime is 21189864287. The next prime is 21189864301. The reversal of 21189864300 is 346898112.

It is not an unprimeable number, because it can be changed into a prime (21189864301) 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 47 ways as a sum of consecutive naturals, for example, 2434356 + ... + 2443044.

Almost surely, 2^21189864300 is an apocalyptic number.

21189864300 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 21189864300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33490564800).

21189864300 is an abundant number, since it is smaller than the sum of its proper divisors (45791265300).

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

21189864300 is a wasteful number, since it uses less digits than its factorization.

21189864300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9456 (or 9449 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 21189864300 in words is "twenty-one billion, one hundred eighty-nine million, eight hundred sixty-four thousand, three hundred".