21236033 has 24 divisors (see below), whose sum is σ = 27230400. Its totient is φ = 16196544.

The previous prime is 21236021. The next prime is 21236041. The reversal of 21236033 is 33063212.

It is not a de Polignac number, because 21236033 - 2⁸ = 21235777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21235996 and 21236014.

It is not an unprimeable number, because it can be changed into a prime (21236063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33998 + ... + 34616.

It is an arithmetic number, because the mean of its divisors is an integer number (1134600).

Almost surely, 2^21236033 is an apocalyptic number.

It is an amenable number.

21236033 is a deficient number, since it is larger than the sum of its proper divisors (5994367).

21236033 is a wasteful number, since it uses less digits than its factorization.

21236033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 21236033 is about 4608.2570457821. The cubic root of 21236033 is about 276.9222152969.

Adding to 21236033 its reverse (33063212), we get a palindrome (54299245).

The spelling of 21236033 in words is "twenty-one million, two hundred thirty-six thousand, thirty-three".