21253100255599 has 2 divisors, whose sum is σ = 21253100255600. Its totient is φ = 21253100255598.

The previous prime is 21253100255579. The next prime is 21253100255641. The reversal of 21253100255599 is 99555200135212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21253100255599 - 2¹¹ = 21253100253551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21253100255579) 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, 10626550127799 + 10626550127800.

It is an arithmetic number, because the mean of its divisors is an integer number (10626550127800).

Almost surely, 2^{21253100255599} is an apocalyptic number.

21253100255599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21253100255599 is an equidigital number, since it uses as much as digits as its factorization.

21253100255599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215000, while the sum is 49.

The spelling of 21253100255599 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred million, two hundred fifty-five thousand, five hundred ninety-nine".