21395328 has 32 divisors (see below), whose sum is σ = 56832360. Its totient is φ = 7131648.

The previous prime is 21395321. The next prime is 21395329. The reversal of 21395328 is 82359312.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395321) 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 3 ways as a sum of consecutive naturals, for example, 27475 + ... + 28242.

Almost surely, 2^21395328 is an apocalyptic number.

It is an amenable number.

21395328 is an abundant number, since it is smaller than the sum of its proper divisors (35437032).

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

21395328 is an equidigital number, since it uses as much as digits as its factorization.

21395328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55734 (or 55722 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 21395328 is about 4625.5084044892. The cubic root of 21395328 is about 277.6129043048.

The spelling of 21395328 in words is "twenty-one million, three hundred ninety-five thousand, three hundred twenty-eight".