21093303 has 32 divisors (see below), whose sum is σ = 35389440. Its totient is φ = 10856160.

The previous prime is 21093301. The next prime is 21093313. The reversal of 21093303 is 30339012.

It is not a de Polignac number, because 21093303 - 2¹ = 21093301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21093303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21093301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28978 + ... + 29696.

It is an arithmetic number, because the mean of its divisors is an integer number (1105920).

Almost surely, 2^21093303 is an apocalyptic number.

21093303 is a deficient number, since it is larger than the sum of its proper divisors (14296137).

21093303 is a wasteful number, since it uses less digits than its factorization.

21093303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 21093303 is about 4592.7446042644. The cubic root of 21093303 is about 276.3004106662.

The spelling of 21093303 in words is "twenty-one million, ninety-three thousand, three hundred three".