21600828 has 36 divisors (see below), whose sum is σ = 54982200. Its totient is φ = 7150176.

The previous prime is 21600823. The next prime is 21600847. The reversal of 21600828 is 82800612.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3351 + ... + 7377.

Almost surely, 2^21600828 is an apocalyptic number.

It is an amenable number.

21600828 is an abundant number, since it is smaller than the sum of its proper divisors (33381372).

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

21600828 is a wasteful number, since it uses less digits than its factorization.

21600828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186 (or 4181 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21600828 is about 4647.6690932122. The cubic root of 21600828 is about 278.4988885227.

The spelling of 21600828 in words is "twenty-one million, six hundred thousand, eight hundred twenty-eight".