21395304 has 48 divisors (see below), whose sum is σ = 66225120. Its totient is φ = 6112800.

The previous prime is 21395303. The next prime is 21395321. The reversal of 21395304 is 40359312.

It is not an unprimeable number, because it can be changed into a prime (21395303) 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, 20722 + ... + 21729.

It is an arithmetic number, because the mean of its divisors is an integer number (1379690).

Almost surely, 2^21395304 is an apocalyptic number.

21395304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21395304 is an abundant number, since it is smaller than the sum of its proper divisors (44829816).

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

21395304 is a wasteful number, since it uses less digits than its factorization.

21395304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42470 (or 42463 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 21395304 is about 4625.5058101790. The cubic root of 21395304 is about 277.6128005016.

The spelling of 21395304 in words is "twenty-one million, three hundred ninety-five thousand, three hundred four".