21123102103 has 8 divisors (see below), whose sum is σ = 21246192000. Its totient is φ = 21000069048.

The previous prime is 21123102079. The next prime is 21123102137. The reversal of 21123102103 is 30120132112.

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 21123102103 - 2¹³ = 21123093911 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 (21123103103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901150 + ... + 924292.

It is an arithmetic number, because the mean of its divisors is an integer number (2655774000).

Almost surely, 2^21123102103 is an apocalyptic number.

21123102103 is a deficient number, since it is larger than the sum of its proper divisors (123089897).

21123102103 is a wasteful number, since it uses less digits than its factorization.

21123102103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28421.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21123102103 its reverse (30120132112), we get a palindrome (51243234215).

The spelling of 21123102103 in words is "twenty-one billion, one hundred twenty-three million, one hundred two thousand, one hundred three".