21093383 has 4 divisors (see below), whose sum is σ = 21161088. Its totient is φ = 21025680.

The previous prime is 21093377. The next prime is 21093407. The reversal of 21093383 is 38339012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21093383 - 2²⁰ = 20044807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21093313) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 33383 + ... + 34008.

It is an arithmetic number, because the mean of its divisors is an integer number (5290272).

Almost surely, 2^21093383 is an apocalyptic number.

21093383 is a deficient number, since it is larger than the sum of its proper divisors (67705).

21093383 is an equidigital number, since it uses as much as digits as its factorization.

21093383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67704.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21093383 is about 4592.7533136453. The cubic root of 21093383 is about 276.3007599715.

The spelling of 21093383 in words is "twenty-one million, ninety-three thousand, three hundred eighty-three".