221242242079 has 2 divisors, whose sum is σ = 221242242080. Its totient is φ = 221242242078.

The previous prime is 221242242077. The next prime is 221242242161. The reversal of 221242242079 is 970242242122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221242242079 - 2¹ = 221242242077 is a prime.

Together with 221242242077, 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 (221242242077) 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, 110621121039 + 110621121040.

It is an arithmetic number, because the mean of its divisors is an integer number (110621121040).

Almost surely, 2^221242242079 is an apocalyptic number.

221242242079 is a deficient number, since it is larger than the sum of its proper divisors (1).

221242242079 is an equidigital number, since it uses as much as digits as its factorization.

221242242079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 221242242079 in words is "two hundred twenty-one billion, two hundred forty-two million, two hundred forty-two thousand, seventy-nine".