21023252454317 has 2 divisors, whose sum is σ = 21023252454318. Its totient is φ = 21023252454316.

The previous prime is 21023252454289. The next prime is 21023252454371. The reversal of 21023252454317 is 71345425232012.

It is a happy number.

Together with next prime (21023252454371) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15366603840676 + 5656648613641 = 3920026^2 + 2378371^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21023252454317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023252453317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511626227158 + 10511626227159.

It is an arithmetic number, because the mean of its divisors is an integer number (10511626227159).

Almost surely, 2^{21023252454317} is an apocalyptic number.

It is an amenable number.

21023252454317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023252454317 is an equidigital number, since it uses as much as digits as its factorization.

21023252454317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 41.

Adding to 21023252454317 its reverse (71345425232012), we get a palindrome (92368677686329).

The spelling of 21023252454317 in words is "twenty-one trillion, twenty-three billion, two hundred fifty-two million, four hundred fifty-four thousand, three hundred seventeen".