21003300300 has 72 divisors (see below), whose sum is σ = 60879134736. Its totient is φ = 5590780160.

The previous prime is 21003300281. The next prime is 21003300337. The reversal of 21003300300 is 300330012.

It is a happy number.

It is a super-2 number, since 2×21003300300² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104254 + ... + 229946.

It is an arithmetic number, because the mean of its divisors is an integer number (845543538).

Almost surely, 2^21003300300 is an apocalyptic number.

21003300300 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 21003300300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30439567368).

21003300300 is an abundant number, since it is smaller than the sum of its proper divisors (39875834436).

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

21003300300 is a wasteful number, since it uses less digits than its factorization.

21003300300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126267 (or 126260 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 12.

Adding to 21003300300 its reverse (300330012), we get a palindrome (21303630312).

The spelling of 21003300300 in words is "twenty-one billion, three million, three hundred thousand, three hundred".