21063103 has 4 divisors (see below), whose sum is σ = 21156120. Its totient is φ = 20970088.

The previous prime is 21063089. The next prime is 21063113. The reversal of 21063103 is 30136012.

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

It is a cyclic number.

It is not a de Polignac number, because 21063103 - 2⁵ = 21063071 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 (21063113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46168 + ... + 46621.

It is an arithmetic number, because the mean of its divisors is an integer number (5289030).

Almost surely, 2^21063103 is an apocalyptic number.

21063103 is a deficient number, since it is larger than the sum of its proper divisors (93017).

21063103 is an equidigital number, since it uses as much as digits as its factorization.

21063103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93016.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 21063103 is about 4589.4556322074. The cubic root of 21063103 is about 276.1684847838.

Adding to 21063103 its reverse (30136012), we get a palindrome (51199115).

The spelling of 21063103 in words is "twenty-one million, sixty-three thousand, one hundred three".