21330341 has 4 divisors (see below), whose sum is σ = 22065900. Its totient is φ = 20594784.

The previous prime is 21330313. The next prime is 21330347. The reversal of 21330341 is 14303312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14853316 + 6477025 = 3854^2 + 2545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330341 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 (21330347) 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, 367736 + ... + 367793.

It is an arithmetic number, because the mean of its divisors is an integer number (5516475).

Almost surely, 2^21330341 is an apocalyptic number.

It is an amenable number.

21330341 is a deficient number, since it is larger than the sum of its proper divisors (735559).

21330341 is an equidigital number, since it uses as much as digits as its factorization.

21330341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735558.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21330341 is about 4618.4782125718. The cubic root of 21330341 is about 277.3315418336.

Adding to 21330341 its reverse (14303312), we get a palindrome (35633653).

The spelling of 21330341 in words is "twenty-one million, three hundred thirty thousand, three hundred forty-one".