20811813214559 has 2 divisors, whose sum is σ = 20811813214560. Its totient is φ = 20811813214558.

The previous prime is 20811813214459. The next prime is 20811813214567. The reversal of 20811813214559 is 95541231811802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20811813214559 - 2³⁶ = 20743093737823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20811813214459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10405906607279 + 10405906607280.

It is an arithmetic number, because the mean of its divisors is an integer number (10405906607280).

Almost surely, 2^{20811813214559} is an apocalyptic number.

20811813214559 is a deficient number, since it is larger than the sum of its proper divisors (1).

20811813214559 is an equidigital number, since it uses as much as digits as its factorization.

20811813214559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 50.

The spelling of 20811813214559 in words is "twenty trillion, eight hundred eleven billion, eight hundred thirteen million, two hundred fourteen thousand, five hundred fifty-nine".