21073533 has 8 divisors (see below), whose sum is σ = 30259488. Its totient is φ = 12968304.

The previous prime is 21073519. The next prime is 21073553. The reversal of 21073533 is 33537012.

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

It is not a de Polignac number, because 21073533 - 2⁶ = 21073469 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073553) 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, 270135 + ... + 270212.

It is an arithmetic number, because the mean of its divisors is an integer number (3782436).

Almost surely, 2^21073533 is an apocalyptic number.

It is an amenable number.

21073533 is a deficient number, since it is larger than the sum of its proper divisors (9185955).

21073533 is a wasteful number, since it uses less digits than its factorization.

21073533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540363.

The product of its (nonzero) digits is 1890, while the sum is 24.

The square root of 21073533 is about 4590.5917919153. The cubic root of 21073533 is about 276.2140615124.

The spelling of 21073533 in words is "twenty-one million, seventy-three thousand, five hundred thirty-three".