21066103 has 8 divisors (see below), whose sum is σ = 21412160. Its totient is φ = 20723040.

The previous prime is 21066049. The next prime is 21066107. The reversal of 21066103 is 30166012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21066103 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 (21066107) 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 7 ways as a sum of consecutive naturals, for example, 16498 + ... + 17728.

It is an arithmetic number, because the mean of its divisors is an integer number (2676520).

Almost surely, 2^21066103 is an apocalyptic number.

21066103 is a deficient number, since it is larger than the sum of its proper divisors (346057).

21066103 is a wasteful number, since it uses less digits than its factorization.

21066103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21066103 is about 4589.7824567184. The cubic root of 21066103 is about 276.1815956429.

Subtracting 21066103 from its reverse (30166012), we obtain a palindrome (9099909).

The spelling of 21066103 in words is "twenty-one million, sixty-six thousand, one hundred three".