21102013023 has 24 divisors (see below), whose sum is σ = 35247321648. Its totient is φ = 11130731136.

The previous prime is 21102013013. The next prime is 21102013057. The reversal of 21102013023 is 32031020112.

It is not a de Polignac number, because 21102013023 - 2¹⁰ = 21102011999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102012993 and 21102013011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102013013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5519286 + ... + 5523107.

It is an arithmetic number, because the mean of its divisors is an integer number (1468638402).

Almost surely, 2^21102013023 is an apocalyptic number.

21102013023 is a deficient number, since it is larger than the sum of its proper divisors (14145308625).

21102013023 is a wasteful number, since it uses less digits than its factorization.

21102013023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11042423 (or 11042416 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21102013023 its reverse (32031020112), we get a palindrome (53133033135).

The spelling of 21102013023 in words is "twenty-one billion, one hundred two million, thirteen thousand, twenty-three".