21617302559 has 2 divisors, whose sum is σ = 21617302560. Its totient is φ = 21617302558.

The previous prime is 21617302541. The next prime is 21617302579. The reversal of 21617302559 is 95520371612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21617302559 - 2¹² = 21617298463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21617302519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808651279 + 10808651280.

It is an arithmetic number, because the mean of its divisors is an integer number (10808651280).

Almost surely, 2^21617302559 is an apocalyptic number.

21617302559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21617302559 is an equidigital number, since it uses as much as digits as its factorization.

21617302559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 21617302559 in words is "twenty-one billion, six hundred seventeen million, three hundred two thousand, five hundred fifty-nine".