21120113123 has 8 divisors (see below), whose sum is σ = 21891412992. Its totient is φ = 20362227336.

The previous prime is 21120113111. The next prime is 21120113129. The reversal of 21120113123 is 32131102112.

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 21120113123 - 2⁴ = 21120113107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120113129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3350315 + ... + 3356612.

It is an arithmetic number, because the mean of its divisors is an integer number (2736426624).

Almost surely, 2^21120113123 is an apocalyptic number.

21120113123 is a deficient number, since it is larger than the sum of its proper divisors (771299869).

21120113123 is an equidigital number, since it uses as much as digits as its factorization.

21120113123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707041.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21120113123 its reverse (32131102112), we get a palindrome (53251215235).

The spelling of 21120113123 in words is "twenty-one billion, one hundred twenty million, one hundred thirteen thousand, one hundred twenty-three".