21055324 has 24 divisors (see below), whose sum is σ = 38235008. Its totient is φ = 10134720.

The previous prime is 21055319. The next prime is 21055343. The reversal of 21055324 is 42355012.

It is a junction number, because it is equal to n+sod(n) for n = 21055295 and 21055304.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 34042 + ... + 34654.

Almost surely, 2^21055324 is an apocalyptic number.

It is an amenable number.

21055324 is a deficient number, since it is larger than the sum of its proper divisors (17179684).

21055324 is a wasteful number, since it uses less digits than its factorization.

21055324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21055324 is about 4588.6080678132. The cubic root of 21055324 is about 276.1344825261.

The spelling of 21055324 in words is "twenty-one million, fifty-five thousand, three hundred twenty-four".