221168879 has 2 divisors, whose sum is σ = 221168880. Its totient is φ = 221168878.

The previous prime is 221168867. The next prime is 221168881. The reversal of 221168879 is 978861122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221168879 - 2⁴ = 221168863 is a prime.

It is a Sophie Germain prime.

Together with 221168881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221168839) 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, 110584439 + 110584440.

It is an arithmetic number, because the mean of its divisors is an integer number (110584440).

Almost surely, 2^221168879 is an apocalyptic number.

221168879 is a deficient number, since it is larger than the sum of its proper divisors (1).

221168879 is an equidigital number, since it uses as much as digits as its factorization.

221168879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 44.

The square root of 221168879 is about 14871.7476780639. The cubic root of 221168879 is about 604.7483223376.

The spelling of 221168879 in words is "two hundred twenty-one million, one hundred sixty-eight thousand, eight hundred seventy-nine".