21055304 has 32 divisors (see below), whose sum is σ = 42215040. Its totient is φ = 9820800.

The previous prime is 21055301. The next prime is 21055319. The reversal of 21055304 is 40355012.

It is not an unprimeable number, because it can be changed into a prime (21055301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6149 + ... + 8939.

It is an arithmetic number, because the mean of its divisors is an integer number (1319220).

Almost surely, 2^21055304 is an apocalyptic number.

It is an amenable number.

21055304 is an abundant number, since it is smaller than the sum of its proper divisors (21159736).

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

21055304 is a wasteful number, since it uses less digits than its factorization.

21055304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861 (or 2857 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21055304 is about 4588.6058885025. The cubic root of 21055304 is about 276.1343950947.

The spelling of 21055304 in words is "twenty-one million, fifty-five thousand, three hundred four".