21432533 has 8 divisors (see below), whose sum is σ = 22293216. Its totient is φ = 20588400.

The previous prime is 21432493. The next prime is 21432539. The reversal of 21432533 is 33523412.

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

It is not a de Polignac number, because 21432533 - 2⁸ = 21432277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21432499 and 21432508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1463 + ... + 6708.

It is an arithmetic number, because the mean of its divisors is an integer number (2786652).

Almost surely, 2^21432533 is an apocalyptic number.

It is an amenable number.

21432533 is a deficient number, since it is larger than the sum of its proper divisors (860683).

21432533 is an equidigital number, since it uses as much as digits as its factorization.

21432533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8275.

The product of its digits is 2160, while the sum is 23.

The square root of 21432533 is about 4629.5283777076. The cubic root of 21432533 is about 277.7737276861.

Adding to 21432533 its reverse (33523412), we get a palindrome (54955945).

The spelling of 21432533 in words is "twenty-one million, four hundred thirty-two thousand, five hundred thirty-three".