21102113023 has 8 divisors (see below), whose sum is σ = 21674488640. Its totient is φ = 20529845280.

The previous prime is 21102112939. The next prime is 21102113077. The reversal of 21102113023 is 32031120112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102113023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102112988 and 21102113006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102113093) 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, 515338 + ... + 554776.

It is an arithmetic number, because the mean of its divisors is an integer number (2709311080).

Almost surely, 2^21102113023 is an apocalyptic number.

21102113023 is a deficient number, since it is larger than the sum of its proper divisors (572375617).

21102113023 is a wasteful number, since it uses less digits than its factorization.

21102113023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53937.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21102113023 its reverse (32031120112), we get a palindrome (53133233135).

The spelling of 21102113023 in words is "twenty-one billion, one hundred two million, one hundred thirteen thousand, twenty-three".