21533113 has 8 divisors (see below), whose sum is σ = 24652800. Its totient is φ = 18424320.

The previous prime is 21533111. The next prime is 21533117. The reversal of 21533113 is 31133512.

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 21533113 - 2¹ = 21533111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21533111) 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, 2088 + ... + 6886.

It is an arithmetic number, because the mean of its divisors is an integer number (3081600).

Almost surely, 2^21533113 is an apocalyptic number.

It is an amenable number.

21533113 is a deficient number, since it is larger than the sum of its proper divisors (3119687).

21533113 is an equidigital number, since it uses as much as digits as its factorization.

21533113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5447.

The product of its digits is 270, while the sum is 19.

The square root of 21533113 is about 4640.3785405934. The cubic root of 21533113 is about 278.2075680115.

Adding to 21533113 its reverse (31133512), we get a palindrome (52666625).

The spelling of 21533113 in words is "twenty-one million, five hundred thirty-three thousand, one hundred thirteen".