21100220310023 has 4 divisors (see below), whose sum is σ = 21100445633688. Its totient is φ = 21099994986360.

The previous prime is 21100220310011. The next prime is 21100220310053. The reversal of 21100220310023 is 32001302200112.

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 21100220310023 - 2²⁰ = 21100219261447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100220309983 and 21100220310010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100220310053) 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 3 ways as a sum of consecutive naturals, for example, 112521308 + ... + 112708673.

It is an arithmetic number, because the mean of its divisors is an integer number (5275111408422).

Almost surely, 2^{21100220310023} is an apocalyptic number.

21100220310023 is a deficient number, since it is larger than the sum of its proper divisors (225323665).

21100220310023 is an equidigital number, since it uses as much as digits as its factorization.

21100220310023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225323664.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21100220310023 its reverse (32001302200112), we get a palindrome (53101522510135).

The spelling of 21100220310023 in words is "twenty-one trillion, one hundred billion, two hundred twenty million, three hundred ten thousand, twenty-three".