21433317 has 8 divisors (see below), whose sum is σ = 28612896. Its totient is φ = 14271312.

The previous prime is 21433289. The next prime is 21433319. The reversal of 21433317 is 71333412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21433317 - 2¹⁰ = 21432293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433319) 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, 1218 + ... + 6659.

It is an arithmetic number, because the mean of its divisors is an integer number (3576612).

Almost surely, 2^21433317 is an apocalyptic number.

It is an amenable number.

21433317 is a deficient number, since it is larger than the sum of its proper divisors (7179579).

21433317 is an equidigital number, since it uses as much as digits as its factorization.

21433317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8787.

The product of its digits is 1512, while the sum is 24.

The square root of 21433317 is about 4629.6130507851. The cubic root of 21433317 is about 277.7771146236. Note that the first 3 decimals are identical.

Adding to 21433317 its reverse (71333412), we get a palindrome (92766729).

It can be divided in two parts, 2143 and 3317, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 21433317 in words is "twenty-one million, four hundred thirty-three thousand, three hundred seventeen".