21112110023 has 4 divisors (see below), whose sum is σ = 21137639400. Its totient is φ = 21086580648.

The previous prime is 21112109999. The next prime is 21112110031. The reversal of 21112110023 is 32001121112.

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 21112110023 - 2²⁴ = 21095332807 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 (21112116023) 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, 12763448 + ... + 12765101.

It is an arithmetic number, because the mean of its divisors is an integer number (5284409850).

Almost surely, 2^21112110023 is an apocalyptic number.

21112110023 is a deficient number, since it is larger than the sum of its proper divisors (25529377).

21112110023 is an equidigital number, since it uses as much as digits as its factorization.

21112110023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25529376.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21112110023 its reverse (32001121112), we get a palindrome (53113231135).

The spelling of 21112110023 in words is "twenty-one billion, one hundred twelve million, one hundred ten thousand, twenty-three".