21336833 has 8 divisors (see below), whose sum is σ = 24413952. Its totient is φ = 18266976.

The previous prime is 21336803. The next prime is 21336839. The reversal of 21336833 is 33863312.

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

It is not a de Polignac number, because 21336833 - 2¹⁸ = 21074689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21336796 and 21336805.

It is not an unprimeable number, because it can be changed into a prime (21336839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8141 + ... + 10437.

It is an arithmetic number, because the mean of its divisors is an integer number (3051744).

Almost surely, 2^21336833 is an apocalyptic number.

It is an amenable number.

21336833 is a deficient number, since it is larger than the sum of its proper divisors (3077119).

21336833 is a wasteful number, since it uses less digits than its factorization.

21336833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631.

The product of its digits is 7776, while the sum is 29.

The square root of 21336833 is about 4619.1809880108. The cubic root of 21336833 is about 277.3596747444.

The spelling of 21336833 in words is "twenty-one million, three hundred thirty-six thousand, eight hundred thirty-three".