21675533 has 8 divisors (see below), whose sum is σ = 23931936. Its totient is φ = 19466800.

The previous prime is 21675529. The next prime is 21675553. The reversal of 21675533 is 33557612.

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

It is a cyclic number.

It is not a de Polignac number, because 21675533 - 2² = 21675529 is a prime.

It is a super-3 number, since 3×21675533³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21675533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675553) 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, 10958 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (2991492).

Almost surely, 2^21675533 is an apocalyptic number.

It is an amenable number.

21675533 is a deficient number, since it is larger than the sum of its proper divisors (2256403).

21675533 is a wasteful number, since it uses less digits than its factorization.

21675533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23835.

The product of its digits is 18900, while the sum is 32.

The square root of 21675533 is about 4655.6989808191. The cubic root of 21675533 is about 278.8195756266.

The spelling of 21675533 in words is "twenty-one million, six hundred seventy-five thousand, five hundred thirty-three".