21054308 has 24 divisors (see below), whose sum is σ = 41053824. Its totient is φ = 9365600.

The previous prime is 21054289. The next prime is 21054311. The reversal of 21054308 is 80345012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3023 + ... + 7158.

It is an arithmetic number, because the mean of its divisors is an integer number (1710576).

Almost surely, 2^21054308 is an apocalyptic number.

It is an amenable number.

21054308 is a deficient number, since it is larger than the sum of its proper divisors (19999516).

21054308 is a wasteful number, since it uses less digits than its factorization.

21054308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10243 (or 10241 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21054308 is about 4588.4973575235. The cubic root of 21054308 is about 276.1300409393.

The spelling of 21054308 in words is "twenty-one million, fifty-four thousand, three hundred eight".