21300300 has 288 divisors, whose sum is σ = 83328000. Its totient is φ = 4656960.

The previous prime is 21300289. The next prime is 21300319. The reversal of 21300300 is 300312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 926089 + ... + 926111.

Almost surely, 2^21300300 is an apocalyptic number.

21300300 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 21300300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41664000).

21300300 is an abundant number, since it is smaller than the sum of its proper divisors (62027700).

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

21300300 is a wasteful number, since it uses less digits than its factorization.

21300300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 21300300 is about 4615.2248049255. The cubic root of 21300300 is about 277.2012855771.

Adding to 21300300 its reverse (300312), we get a palindrome (21600612).

The spelling of 21300300 in words is "twenty-one million, three hundred thousand, three hundred".