21232223317 has 2 divisors, whose sum is σ = 21232223318. Its totient is φ = 21232223316.

The previous prime is 21232223297. The next prime is 21232223377. The reversal of 21232223317 is 71332223212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20062172881 + 1170050436 = 141641^2 + 34206^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232223317 - 2¹⁹ = 21231699029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232223377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616111658 + 10616111659.

It is an arithmetic number, because the mean of its divisors is an integer number (10616111659).

Almost surely, 2^21232223317 is an apocalyptic number.

It is an amenable number.

21232223317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232223317 is an equidigital number, since it uses as much as digits as its factorization.

21232223317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 28.

Adding to 21232223317 its reverse (71332223212), we get a palindrome (92564446529).

The spelling of 21232223317 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, three hundred seventeen".