21330133 has 4 divisors (see below), whose sum is σ = 23269248. Its totient is φ = 19391020.

The previous prime is 21330119. The next prime is 21330149. The reversal of 21330133 is 33103312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21330133 - 2¹³ = 21321941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330163) 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 3 ways as a sum of consecutive naturals, for example, 969541 + ... + 969562.

It is an arithmetic number, because the mean of its divisors is an integer number (5817312).

Almost surely, 2^21330133 is an apocalyptic number.

It is an amenable number.

21330133 is a deficient number, since it is larger than the sum of its proper divisors (1939115).

21330133 is a wasteful number, since it uses less digits than its factorization.

21330133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939114.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 21330133 is about 4618.4556942770. The cubic root of 21330133 is about 277.3306403767.

Adding to 21330133 its reverse (33103312), we get a palindrome (54433445).

The spelling of 21330133 in words is "twenty-one million, three hundred thirty thousand, one hundred thirty-three".