21233433 has 16 divisors (see below), whose sum is σ = 30582720. Its totient is φ = 13026624.

The previous prime is 21233413. The next prime is 21233441. The reversal of 21233433 is 33433212.

It is not a de Polignac number, because 21233433 - 2⁶ = 21233369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21233413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16663 + ... + 17891.

It is an arithmetic number, because the mean of its divisors is an integer number (1911420).

Almost surely, 2^21233433 is an apocalyptic number.

It is an amenable number.

21233433 is a deficient number, since it is larger than the sum of its proper divisors (9349287).

21233433 is a wasteful number, since it uses less digits than its factorization.

21233433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688.

The product of its digits is 1296, while the sum is 21.

The square root of 21233433 is about 4607.9749348277. The cubic root of 21233433 is about 276.9109133249.

Adding to 21233433 its reverse (33433212), we get a palindrome (54666645).

The spelling of 21233433 in words is "twenty-one million, two hundred thirty-three thousand, four hundred thirty-three".