21033133 has 16 divisors (see below), whose sum is σ = 24344640. Its totient is φ = 17971200.

The previous prime is 21033127. The next prime is 21033151. The reversal of 21033133 is 33133012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033133 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 (21033163) 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 15 ways as a sum of consecutive naturals, for example, 32493 + ... + 33133.

It is an arithmetic number, because the mean of its divisors is an integer number (1521540).

Almost surely, 2^21033133 is an apocalyptic number.

It is an amenable number.

21033133 is a deficient number, since it is larger than the sum of its proper divisors (3311507).

21033133 is a wasteful number, since it uses less digits than its factorization.

21033133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828.

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

The square root of 21033133 is about 4586.1893768138. The cubic root of 21033133 is about 276.0374389106.

Adding to 21033133 its reverse (33133012), we get a palindrome (54166145).

The spelling of 21033133 in words is "twenty-one million, thirty-three thousand, one hundred thirty-three".