21604300 has 36 divisors (see below), whose sum is σ = 48156640. Its totient is φ = 8406720.

The previous prime is 21604267. The next prime is 21604301. The reversal of 21604300 is 340612.

It is not an unprimeable number, because it can be changed into a prime (21604301) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 781 + ... + 6619.

Almost surely, 2^21604300 is an apocalyptic number.

21604300 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 21604300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24078320).

21604300 is an abundant number, since it is smaller than the sum of its proper divisors (26552340).

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

21604300 is a wasteful number, since it uses less digits than its factorization.

21604300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5890 (or 5883 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21604300 is about 4648.0425987721. The cubic root of 21604300 is about 278.5138091906.

Adding to 21604300 its reverse (340612), we get a palindrome (21944912).

It can be divided in two parts, 21604 and 300, that added together give a square (21904 = 148²).

The spelling of 21604300 in words is "twenty-one million, six hundred four thousand, three hundred".