21195328 has 168 divisors, whose sum is σ = 58375296. Its totient is φ = 7434240.

The previous prime is 21195323. The next prime is 21195341. The reversal of 21195328 is 82359112.

Its product of digits (4320) is a multiple of the sum of its prime divisors (60).

It is a self number, because there is not a number n which added to its sum of digits gives 21195328.

It is not an unprimeable number, because it can be changed into a prime (21195323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 921525 + ... + 921547.

It is an arithmetic number, because the mean of its divisors is an integer number (347472).

Almost surely, 2^21195328 is an apocalyptic number.

21195328 is a gapful number since it is divisible by the number (28) 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 21195328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29187648).

21195328 is an abundant number, since it is smaller than the sum of its proper divisors (37179968).

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

21195328 is a wasteful number, since it uses less digits than its factorization.

21195328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 60 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 21195328 is about 4603.8383985540. The cubic root of 21195328 is about 276.7451682852.

It can be divided in two parts, 2119 and 5328, that added together give a palindrome (7447).

The spelling of 21195328 in words is "twenty-one million, one hundred ninety-five thousand, three hundred twenty-eight".