21332203 has 4 divisors (see below), whose sum is σ = 21439600. Its totient is φ = 21224808.

The previous prime is 21332189. The next prime is 21332209. The reversal of 21332203 is 30223312.

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 21332203 - 2¹³ = 21324011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332209) 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, 53400 + ... + 53797.

It is an arithmetic number, because the mean of its divisors is an integer number (5359900).

Almost surely, 2^21332203 is an apocalyptic number.

21332203 is a deficient number, since it is larger than the sum of its proper divisors (107397).

21332203 is a wasteful number, since it uses less digits than its factorization.

21332203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107396.

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

The square root of 21332203 is about 4618.6797897235. The cubic root of 21332203 is about 277.3396113452.

Adding to 21332203 its reverse (30223312), we get a palindrome (51555515).

The spelling of 21332203 in words is "twenty-one million, three hundred thirty-two thousand, two hundred three".