111021207005809 has 2 divisors, whose sum is σ = 111021207005810. Its totient is φ = 111021207005808.

The previous prime is 111021207005777. The next prime is 111021207005827. The reversal of 111021207005809 is 908500702120111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85359860121600 + 25661346884209 = 9239040^2 + 5065703^2 .

It is a cyclic number.

It is not a de Polignac number, because 111021207005809 - 2⁵ = 111021207005777 is a prime.

It is not a weakly prime, because it can be changed into another prime (111021207005899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510603502904 + 55510603502905.

It is an arithmetic number, because the mean of its divisors is an integer number (55510603502905).

Almost surely, 2^{111021207005809} is an apocalyptic number.

It is an amenable number.

111021207005809 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021207005809 is an equidigital number, since it uses as much as digits as its factorization.

111021207005809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 37.

The spelling of 111021207005809 in words is "one hundred eleven trillion, twenty-one billion, two hundred seven million, five thousand, eight hundred nine".