21103011323 has 4 divisors (see below), whose sum is σ = 21257048040. Its totient is φ = 20948974608.

The previous prime is 21103011311. The next prime is 21103011337. The reversal of 21103011323 is 32311030112.

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 21103011323 - 2¹² = 21103007227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103611323) 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, 77018153 + ... + 77018426.

It is an arithmetic number, because the mean of its divisors is an integer number (5314262010).

Almost surely, 2^21103011323 is an apocalyptic number.

21103011323 is a deficient number, since it is larger than the sum of its proper divisors (154036717).

21103011323 is a wasteful number, since it uses less digits than its factorization.

21103011323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154036716.

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

Adding to 21103011323 its reverse (32311030112), we get a palindrome (53414041435).

The spelling of 21103011323 in words is "twenty-one billion, one hundred three million, eleven thousand, three hundred twenty-three".