21027300 has 288 divisors, whose sum is σ = 79994880. Its totient is φ = 4147200.

The previous prime is 21027287. The next prime is 21027323. The reversal of 21027300 is 372012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21027300.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 678285 + ... + 678315.

It is an arithmetic number, because the mean of its divisors is an integer number (277760).

Almost surely, 2^21027300 is an apocalyptic number.

21027300 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 21027300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39997440).

21027300 is an abundant number, since it is smaller than the sum of its proper divisors (58967580).

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

21027300 is a wasteful number, since it uses less digits than its factorization.

21027300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 21027300 is about 4585.5534017172. The cubic root of 21027300 is about 276.0119192500.

Adding to 21027300 its reverse (372012), we get a palindrome (21399312).

The spelling of 21027300 in words is "twenty-one million, twenty-seven thousand, three hundred".