21616543353259 has 2 divisors, whose sum is σ = 21616543353260. Its totient is φ = 21616543353258.

The previous prime is 21616543353157. The next prime is 21616543353269. The reversal of 21616543353259 is 95235334561612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21616543353259 - 2²⁹ = 21616006482347 is a prime.

It is not a weakly prime, because it can be changed into another prime (21616543353269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808271676629 + 10808271676630.

It is an arithmetic number, because the mean of its divisors is an integer number (10808271676630).

Almost surely, 2^{21616543353259} is an apocalyptic number.

21616543353259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616543353259 is an equidigital number, since it uses as much as digits as its factorization.

21616543353259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496000, while the sum is 55.

The spelling of 21616543353259 in words is "twenty-one trillion, six hundred sixteen billion, five hundred forty-three million, three hundred fifty-three thousand, two hundred fifty-nine".