21003103103 has 4 divisors (see below), whose sum is σ = 21102644088. Its totient is φ = 20903562120.

The previous prime is 21003103049. The next prime is 21003103133. The reversal of 21003103103 is 30130130012.

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 21003103103 - 2⁸ = 21003102847 is a prime.

It is a super-2 number, since 2×21003103103² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003103133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49770176 + ... + 49770597.

It is an arithmetic number, because the mean of its divisors is an integer number (5275661022).

Almost surely, 2^21003103103 is an apocalyptic number.

21003103103 is a deficient number, since it is larger than the sum of its proper divisors (99540985).

21003103103 is an equidigital number, since it uses as much as digits as its factorization.

21003103103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99540984.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21003103103 its reverse (30130130012), we get a palindrome (51133233115).

The spelling of 21003103103 in words is "twenty-one billion, three million, one hundred three thousand, one hundred three".