221163871 has 2 divisors, whose sum is σ = 221163872. Its totient is φ = 221163870.

The previous prime is 221163869. The next prime is 221163893. The reversal of 221163871 is 178361122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221163871 - 2¹ = 221163869 is a prime.

Together with 221163869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221163671) 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, 110581935 + 110581936.

It is an arithmetic number, because the mean of its divisors is an integer number (110581936).

Almost surely, 2^221163871 is an apocalyptic number.

221163871 is a deficient number, since it is larger than the sum of its proper divisors (1).

221163871 is an equidigital number, since it uses as much as digits as its factorization.

221163871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 221163871 is about 14871.5793041627. The cubic root of 221163871 is about 604.7437577978.

The spelling of 221163871 in words is "two hundred twenty-one million, one hundred sixty-three thousand, eight hundred seventy-one".