21011113303023 has 4 divisors (see below), whose sum is σ = 28014817737368. Its totient is φ = 14007408868680.

The previous prime is 21011113303013. The next prime is 21011113303031. The reversal of 21011113303023 is 32030331111012.

It is a happy number.

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

It is not a de Polignac number, because 21011113303023 - 2²⁸ = 21010844867567 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 (21011113303013) 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, 3501852217168 + ... + 3501852217173.

It is an arithmetic number, because the mean of its divisors is an integer number (7003704434342).

Almost surely, 2^{21011113303023} is an apocalyptic number.

21011113303023 is a deficient number, since it is larger than the sum of its proper divisors (7003704434345).

21011113303023 is an equidigital number, since it uses as much as digits as its factorization.

21011113303023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003704434344.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 21011113303023 its reverse (32030331111012), we get a palindrome (53041444414035).

The spelling of 21011113303023 in words is "twenty-one trillion, eleven billion, one hundred thirteen million, three hundred three thousand, twenty-three".