21230013023 has 4 divisors (see below), whose sum is σ = 21230305488. Its totient is φ = 21229720560.

The previous prime is 21230013017. The next prime is 21230013031. The reversal of 21230013023 is 32031003212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21230013023 - 2¹⁴ = 21229996639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230012992 and 21230013010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230013053) 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, 54515 + ... + 213147.

It is an arithmetic number, because the mean of its divisors is an integer number (5307576372).

Almost surely, 2^21230013023 is an apocalyptic number.

21230013023 is a deficient number, since it is larger than the sum of its proper divisors (292465).

21230013023 is a wasteful number, since it uses less digits than its factorization.

21230013023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292464.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21230013023 its reverse (32031003212), we get a palindrome (53261016235).

The spelling of 21230013023 in words is "twenty-one billion, two hundred thirty million, thirteen thousand, twenty-three".