221466859 has 2 divisors, whose sum is σ = 221466860. Its totient is φ = 221466858.

The previous prime is 221466829. The next prime is 221466877. The reversal of 221466859 is 958664122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221466859 - 2⁷ = 221466731 is a prime.

It is a super-3 number, since 3×221466859³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (221466829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110733429 + 110733430.

It is an arithmetic number, because the mean of its divisors is an integer number (110733430).

Almost surely, 2^221466859 is an apocalyptic number.

221466859 is a deficient number, since it is larger than the sum of its proper divisors (1).

221466859 is an equidigital number, since it uses as much as digits as its factorization.

221466859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 221466859 is about 14881.7626308176. The cubic root of 221466859 is about 605.0197921718.

The spelling of 221466859 in words is "two hundred twenty-one million, four hundred sixty-six thousand, eight hundred fifty-nine".