221386564859 has 2 divisors, whose sum is σ = 221386564860. Its totient is φ = 221386564858.

The previous prime is 221386564783. The next prime is 221386564909. The reversal of 221386564859 is 958465683122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221386564859 - 2²⁰ = 221385516283 is a prime.

It is a super-2 number, since 2×221386564859² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221386564798 and 221386564807.

It is not a weakly prime, because it can be changed into another prime (221386564559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110693282429 + 110693282430.

It is an arithmetic number, because the mean of its divisors is an integer number (110693282430).

Almost surely, 2^221386564859 is an apocalyptic number.

221386564859 is a deficient number, since it is larger than the sum of its proper divisors (1).

221386564859 is an equidigital number, since it uses as much as digits as its factorization.

221386564859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24883200, while the sum is 59.

The spelling of 221386564859 in words is "two hundred twenty-one billion, three hundred eighty-six million, five hundred sixty-four thousand, eight hundred fifty-nine".