21233203 has 16 divisors (see below), whose sum is σ = 23214240. Its totient is φ = 19353600.

The previous prime is 21233197. The next prime is 21233213. The reversal of 21233203 is 30233212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75423 + ... + 75703.

It is an arithmetic number, because the mean of its divisors is an integer number (1450890).

Almost surely, 2^21233203 is an apocalyptic number.

21233203 is a deficient number, since it is larger than the sum of its proper divisors (1981037).

21233203 is a wasteful number, since it uses less digits than its factorization.

21233203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21233203 is about 4607.9499780271. The cubic root of 21233203 is about 276.9099134907.

Adding to 21233203 its reverse (30233212), we get a palindrome (51466415).

Subtracting 21233203 from its reverse (30233212), we obtain a palindrome (9000009).

The spelling of 21233203 in words is "twenty-one million, two hundred thirty-three thousand, two hundred three".