21134305 has 8 divisors (see below), whose sum is σ = 25547112. Its totient is φ = 16783488.

The previous prime is 21134293. The next prime is 21134353. The reversal of 21134305 is 50343112.

It can be written as a sum of positive squares in 4 ways, for example, as 404496 + 20729809 = 636^2 + 4553^2 .

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 21134305 - 2⁵ = 21134273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 14742 + ... + 16111.

It is an arithmetic number, because the mean of its divisors is an integer number (3193389).

Almost surely, 2^21134305 is an apocalyptic number.

It is an amenable number.

21134305 is a deficient number, since it is larger than the sum of its proper divisors (4412807).

21134305 is a wasteful number, since it uses less digits than its factorization.

21134305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30995.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21134305 is about 4597.2062168234. The cubic root of 21134305 is about 276.4793226943.

Adding to 21134305 its reverse (50343112), we get a palindrome (71477417).

The spelling of 21134305 in words is "twenty-one million, one hundred thirty-four thousand, three hundred five".