221560879 has 2 divisors, whose sum is σ = 221560880. Its totient is φ = 221560878.

The previous prime is 221560877. The next prime is 221560883. The reversal of 221560879 is 978065122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221560879 - 2¹ = 221560877 is a prime.

Together with 221560877, 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 (221560873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110780439 + 110780440.

It is an arithmetic number, because the mean of its divisors is an integer number (110780440).

Almost surely, 2^221560879 is an apocalyptic number.

221560879 is a deficient number, since it is larger than the sum of its proper divisors (1).

221560879 is an equidigital number, since it uses as much as digits as its factorization.

221560879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 221560879 is about 14884.9211956261. The cubic root of 221560879 is about 605.1053970237.

The spelling of 221560879 in words is "two hundred twenty-one million, five hundred sixty thousand, eight hundred seventy-nine".