21339203 has 8 divisors (see below), whose sum is σ = 21772416. Its totient is φ = 20908800.

The previous prime is 21339181. The next prime is 21339209. The reversal of 21339203 is 30293312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21339203 - 2⁶ = 21339139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21339209) 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 7 ways as a sum of consecutive naturals, for example, 21038 + ... + 22028.

It is an arithmetic number, because the mean of its divisors is an integer number (2721552).

Almost surely, 2^21339203 is an apocalyptic number.

21339203 is a deficient number, since it is larger than the sum of its proper divisors (433213).

21339203 is an equidigital number, since it uses as much as digits as its factorization.

21339203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 21339203 is about 4619.4375198719. The cubic root of 21339203 is about 277.3699436550.

The spelling of 21339203 in words is "twenty-one million, three hundred thirty-nine thousand, two hundred three".