21301103123 has 4 divisors (see below), whose sum is σ = 21369595728. Its totient is φ = 21232610520.

The previous prime is 21301103101. The next prime is 21301103179. The reversal of 21301103123 is 32130110312.

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 21301103123 - 2²⁰ = 21300054547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301103423) 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, 34245836 + ... + 34246457.

It is an arithmetic number, because the mean of its divisors is an integer number (5342398932).

Almost surely, 2^21301103123 is an apocalyptic number.

21301103123 is a deficient number, since it is larger than the sum of its proper divisors (68492605).

21301103123 is an equidigital number, since it uses as much as digits as its factorization.

21301103123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68492604.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21301103123 its reverse (32130110312), we get a palindrome (53431213435).

It can be divided in two parts, 2130110312 and 3, that multiplied together give a palindrome (6390330936).

The spelling of 21301103123 in words is "twenty-one billion, three hundred one million, one hundred three thousand, one hundred twenty-three".