21301213023 has 12 divisors (see below), whose sum is σ = 31829399160. Its totient is φ = 13711125456.

The previous prime is 21301213009. The next prime is 21301213033. The reversal of 21301213023 is 32031210312.

It is not a de Polignac number, because 21301213023 - 2⁵ = 21301212991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301212987 and 21301213005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301213033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40806661 + ... + 40807182.

It is an arithmetic number, because the mean of its divisors is an integer number (2652449930).

Almost surely, 2^21301213023 is an apocalyptic number.

21301213023 is a deficient number, since it is larger than the sum of its proper divisors (10528186137).

21301213023 is a wasteful number, since it uses less digits than its factorization.

21301213023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81613878 (or 81613875 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21301213023 its reverse (32031210312), we get a palindrome (53332423335).

The spelling of 21301213023 in words is "twenty-one billion, three hundred one million, two hundred thirteen thousand, twenty-three".