21195304 has 48 divisors (see below), whose sum is σ = 43909020. Its totient is φ = 9584640.

The previous prime is 21195301. The next prime is 21195313. The reversal of 21195304 is 40359112.

It can be written as a sum of positive squares in 6 ways, for example, as 3572100 + 17623204 = 1890^2 + 4198^2 .

It is not an unprimeable number, because it can be changed into a prime (21195301) 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, 82344 + ... + 82600.

Almost surely, 2^21195304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21195304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21954510).

21195304 is an abundant number, since it is smaller than the sum of its proper divisors (22713716).

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

21195304 is a wasteful number, since it uses less digits than its factorization.

21195304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21195304 is about 4603.8357920326. The cubic root of 21195304 is about 276.7450638300.

The spelling of 21195304 in words is "twenty-one million, one hundred ninety-five thousand, three hundred four".