21230023313 has 2 divisors, whose sum is σ = 21230023314. Its totient is φ = 21230023312.

The previous prime is 21230023289. The next prime is 21230023333. The reversal of 21230023313 is 31332003212.

It is an a-pointer prime, because the next prime (21230023333) can be obtained adding 21230023313 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20116599889 + 1113423424 = 141833^2 + 33368^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230023313 - 2²⁴ = 21213246097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21230023333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615011656 + 10615011657.

It is an arithmetic number, because the mean of its divisors is an integer number (10615011657).

Almost surely, 2^21230023313 is an apocalyptic number.

It is an amenable number.

21230023313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230023313 is an equidigital number, since it uses as much as digits as its factorization.

21230023313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21230023313 its reverse (31332003212), we get a palindrome (52562026525).

The spelling of 21230023313 in words is "twenty-one billion, two hundred thirty million, twenty-three thousand, three hundred thirteen".