21133203 has 32 divisors (see below), whose sum is σ = 34944000. Its totient is φ = 11062656.

The previous prime is 21133153. The next prime is 21133213. The reversal of 21133203 is 30233112.

It is not a de Polignac number, because 21133203 - 2⁹ = 21132691 is a prime.

It is a super-2 number, since 2×21133203² = 893224538078418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21133213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54133 + ... + 54521.

It is an arithmetic number, because the mean of its divisors is an integer number (1092000).

Almost surely, 2^21133203 is an apocalyptic number.

21133203 is a deficient number, since it is larger than the sum of its proper divisors (13810797).

21133203 is a wasteful number, since it uses less digits than its factorization.

21133203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21133203 is about 4597.0863598588. The cubic root of 21133203 is about 276.4745171501.

Adding to 21133203 its reverse (30233112), we get a palindrome (51366315).

Subtracting 21133203 from its reverse (30233112), we obtain a palindrome (9099909).

The spelling of 21133203 in words is "twenty-one million, one hundred thirty-three thousand, two hundred three".