210021300 has 54 divisors (see below), whose sum is σ = 658302918. Its totient is φ = 56005440.

The previous prime is 210021293. The next prime is 210021379. The reversal of 210021300 is 3120012.

It is a happy number.

210021300 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 3006756 + 207014544 = 1734^2 + 14388^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 115779 + ... + 117578.

Almost surely, 2^210021300 is an apocalyptic number.

210021300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021300 is an abundant number, since it is smaller than the sum of its proper divisors (448281618).

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

210021300 is a wasteful number, since it uses less digits than its factorization.

210021300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233377 (or 233367 counting only the distinct ones).

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

The square root of 210021300 is about 14492.1116473756. Note that the first 3 decimals coincide. The cubic root of 210021300 is about 594.4122907140.

Adding to 210021300 its reverse (3120012), we get a palindrome (213141312).

The spelling of 210021300 in words is "two hundred ten million, twenty-one thousand, three hundred".