21020100300 has 54 divisors (see below), whose sum is σ = 65886339428. Its totient is φ = 5605359840.

The previous prime is 21020100289. The next prime is 21020100307. The reversal of 21020100300 is 300102012.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21020100307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11676934 + ... + 11678733.

Almost surely, 2^21020100300 is an apocalyptic number.

21020100300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020100300 is an abundant number, since it is smaller than the sum of its proper divisors (44866239128).

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

21020100300 is a wasteful number, since it uses less digits than its factorization.

21020100300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23355687 (or 23355677 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21020100300 its reverse (300102012), we get a palindrome (21320202312).

The spelling of 21020100300 in words is "twenty-one billion, twenty million, one hundred thousand, three hundred".