21050333 has 8 divisors (see below), whose sum is σ = 21784320. Its totient is φ = 20319840.

The previous prime is 21050311. The next prime is 21050339. The reversal of 21050333 is 33305012.

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 21050333 - 2⁶ = 21050269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050339) 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 7 ways as a sum of consecutive naturals, for example, 18641 + ... + 19737.

It is an arithmetic number, because the mean of its divisors is an integer number (2723040).

Almost surely, 2^21050333 is an apocalyptic number.

It is an amenable number.

21050333 is a deficient number, since it is larger than the sum of its proper divisors (733987).

21050333 is a wasteful number, since it uses less digits than its factorization.

21050333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 21050333 is about 4588.0641887402. The cubic root of 21050333 is about 276.1126622949.

Subtracting from 21050333 its sum of digits (17), we obtain a triangular number (21050316 = T₆₄₈₈).

Adding to 21050333 its reverse (33305012), we get a palindrome (54355345).

The spelling of 21050333 in words is "twenty-one million, fifty thousand, three hundred thirty-three".