21233305 has 16 divisors (see below), whose sum is σ = 26066304. Its totient is φ = 16600320.

The previous prime is 21233299. The next prime is 21233321. The reversal of 21233305 is 50333212.

It is not a de Polignac number, because 21233305 - 2⁵ = 21233273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80604 + ... + 80866.

It is an arithmetic number, because the mean of its divisors is an integer number (1629144).

Almost surely, 2^21233305 is an apocalyptic number.

It is an amenable number.

21233305 is a deficient number, since it is larger than the sum of its proper divisors (4832999).

21233305 is a wasteful number, since it uses less digits than its factorization.

21233305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 21233305 is about 4607.9610458423. The cubic root of 21233305 is about 276.9103568963.

Adding to 21233305 its reverse (50333212), we get a palindrome (71566517).

The spelling of 21233305 in words is "twenty-one million, two hundred thirty-three thousand, three hundred five".