221466331 has 2 divisors, whose sum is σ = 221466332. Its totient is φ = 221466330.

The previous prime is 221466319. The next prime is 221466341. The reversal of 221466331 is 133664122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221466331 - 2⁹ = 221465819 is a prime.

It is a super-2 number, since 2×221466331² = 98094671533203122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221466331.

It is not a weakly prime, because it can be changed into another prime (221466341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110733165 + 110733166.

It is an arithmetic number, because the mean of its divisors is an integer number (110733166).

Almost surely, 2^221466331 is an apocalyptic number.

221466331 is a deficient number, since it is larger than the sum of its proper divisors (1).

221466331 is an equidigital number, since it uses as much as digits as its factorization.

221466331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 221466331 is about 14881.7448909730. The cubic root of 221466331 is about 605.0193113614.

The spelling of 221466331 in words is "two hundred twenty-one million, four hundred sixty-six thousand, three hundred thirty-one".