21344133 has 4 divisors (see below), whose sum is σ = 28458848. Its totient is φ = 14229420.

The previous prime is 21344131. The next prime is 21344159. The reversal of 21344133 is 33144312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21344133 - 2¹ = 21344131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344131) 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 3 ways as a sum of consecutive naturals, for example, 3557353 + ... + 3557358.

It is an arithmetic number, because the mean of its divisors is an integer number (7114712).

Almost surely, 2^21344133 is an apocalyptic number.

It is an amenable number.

21344133 is a deficient number, since it is larger than the sum of its proper divisors (7114715).

21344133 is an equidigital number, since it uses as much as digits as its factorization.

21344133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114714.

The product of its digits is 864, while the sum is 21.

The square root of 21344133 is about 4619.9711038057. The cubic root of 21344133 is about 277.3913022867.

Adding to 21344133 its reverse (33144312), we get a palindrome (54488445).

The spelling of 21344133 in words is "twenty-one million, three hundred forty-four thousand, one hundred thirty-three".