21063533 has 8 divisors (see below), whose sum is σ = 22454400. Its totient is φ = 19700928.

The previous prime is 21063529. The next prime is 21063569. The reversal of 21063533 is 33536012.

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 21063533 - 2² = 21063529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21063499 and 21063508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063503) 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, 5516 + ... + 8517.

It is an arithmetic number, because the mean of its divisors is an integer number (2806800).

Almost surely, 2^21063533 is an apocalyptic number.

It is an amenable number.

21063533 is a deficient number, since it is larger than the sum of its proper divisors (1390867).

21063533 is a wasteful number, since it uses less digits than its factorization.

21063533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14131.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 21063533 is about 4589.5024784828. The cubic root of 21063533 is about 276.1703640834.

Adding to 21063533 its reverse (33536012), we get a palindrome (54599545).

The spelling of 21063533 in words is "twenty-one million, sixty-three thousand, five hundred thirty-three".