21102123023 has 8 divisors (see below), whose sum is σ = 21616949760. Its totient is φ = 20592744480.

The previous prime is 21102123019. The next prime is 21102123047. The reversal of 21102123023 is 32032120112.

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 21102123023 - 2² = 21102123019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102122992 and 21102123010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102123073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1354208 + ... + 1369701.

It is an arithmetic number, because the mean of its divisors is an integer number (2702118720).

Almost surely, 2^21102123023 is an apocalyptic number.

21102123023 is a deficient number, since it is larger than the sum of its proper divisors (514826737).

21102123023 is a wasteful number, since it uses less digits than its factorization.

21102123023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724097.

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

Adding to 21102123023 its reverse (32032120112), we get a palindrome (53134243135).

The spelling of 21102123023 in words is "twenty-one billion, one hundred two million, one hundred twenty-three thousand, twenty-three".