21112323023 has 4 divisors (see below), whose sum is σ = 23031625128. Its totient is φ = 19193020920.

The previous prime is 21112322999. The next prime is 21112323041. The reversal of 21112323023 is 32032321112.

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 21112323023 - 2²⁰ = 21111274447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112322986 and 21112323004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112320023) 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, 959651036 + ... + 959651057.

It is an arithmetic number, because the mean of its divisors is an integer number (5757906282).

Almost surely, 2^21112323023 is an apocalyptic number.

21112323023 is a deficient number, since it is larger than the sum of its proper divisors (1919302105).

21112323023 is a wasteful number, since it uses less digits than its factorization.

21112323023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919302104.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21112323023 its reverse (32032321112), we get a palindrome (53144644135).

The spelling of 21112323023 in words is "twenty-one billion, one hundred twelve million, three hundred twenty-three thousand, twenty-three".