21600003 has 16 divisors (see below), whose sum is σ = 29352960. Its totient is φ = 14126304.

The previous prime is 21600001. The next prime is 21600011. The reversal of 21600003 is 30000612.

It is not a de Polignac number, because 21600003 - 2¹ = 21600001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21600001) 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 15 ways as a sum of consecutive naturals, for example, 55333 + ... + 55721.

It is an arithmetic number, because the mean of its divisors is an integer number (1834560).

Almost surely, 2^21600003 is an apocalyptic number.

21600003 is a deficient number, since it is larger than the sum of its proper divisors (7752957).

21600003 is a wasteful number, since it uses less digits than its factorization.

21600003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21600003 is about 4647.5803381975. The cubic root of 21600003 is about 278.4953429101.

Adding to 21600003 its reverse (30000612), we get a palindrome (51600615).

The spelling of 21600003 in words is "twenty-one million, six hundred thousand, three".