21020300 has 36 divisors (see below), whose sum is σ = 52132080. Its totient is φ = 7206720.

The previous prime is 21020299. The next prime is 21020303. The reversal of 21020300 is 302012.

It is not an unprimeable number, because it can be changed into a prime (21020303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14315 + ... + 15714.

Almost surely, 2^21020300 is an apocalyptic number.

21020300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020300 is an abundant number, since it is smaller than the sum of its proper divisors (31111780).

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

21020300 is a wasteful number, since it uses less digits than its factorization.

21020300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30050 (or 30043 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 21020300 is about 4584.7900715300. The cubic root of 21020300 is about 275.9812876763.

Adding to 21020300 its reverse (302012), we get a palindrome (21322312).

The spelling of 21020300 in words is "twenty-one million, twenty thousand, three hundred".