21335433 has 12 divisors (see below), whose sum is σ = 33091920. Its totient is φ = 12191592.

The previous prime is 21335411. The next prime is 21335437. The reversal of 21335433 is 33453312.

It is a happy number.

It is not a de Polignac number, because 21335433 - 2¹⁸ = 21073289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21335437) 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 11 ways as a sum of consecutive naturals, for example, 72423 + ... + 72716.

It is an arithmetic number, because the mean of its divisors is an integer number (2757660).

Almost surely, 2^21335433 is an apocalyptic number.

It is an amenable number.

21335433 is a deficient number, since it is larger than the sum of its proper divisors (11756487).

21335433 is a wasteful number, since it uses less digits than its factorization.

21335433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145156 (or 145149 counting only the distinct ones).

The product of its digits is 3240, while the sum is 24.

The square root of 21335433 is about 4619.0294435087. The cubic root of 21335433 is about 277.3536083640.

Adding to 21335433 its reverse (33453312), we get a palindrome (54788745).

The spelling of 21335433 in words is "twenty-one million, three hundred thirty-five thousand, four hundred thirty-three".