23638816321 has 2 divisors, whose sum is σ = 23638816322. Its totient is φ = 23638816320.

The previous prime is 23638816303. The next prime is 23638816343. The reversal of 23638816321 is 12361883632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15415953921 + 8222862400 = 124161^2 + 90680^2 .

It is a cyclic number.

It is not a de Polignac number, because 23638816321 - 2¹¹ = 23638814273 is a prime.

It is not a weakly prime, because it can be changed into another prime (23638816381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11819408160 + 11819408161.

It is an arithmetic number, because the mean of its divisors is an integer number (11819408161).

Almost surely, 2^23638816321 is an apocalyptic number.

It is an amenable number.

23638816321 is a deficient number, since it is larger than the sum of its proper divisors (1).

23638816321 is an equidigital number, since it uses as much as digits as its factorization.

23638816321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The spelling of 23638816321 in words is "twenty-three billion, six hundred thirty-eight million, eight hundred sixteen thousand, three hundred twenty-one".