221927689 has 2 divisors, whose sum is σ = 221927690. Its totient is φ = 221927688.

The previous prime is 221927683. The next prime is 221927701. The reversal of 221927689 is 986729122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221771664 + 156025 = 14892^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 221927689 - 2¹⁹ = 221403401 is a prime.

It is not a weakly prime, because it can be changed into another prime (221927683) 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, 110963844 + 110963845.

It is an arithmetic number, because the mean of its divisors is an integer number (110963845).

Almost surely, 2^221927689 is an apocalyptic number.

It is an amenable number.

221927689 is a deficient number, since it is larger than the sum of its proper divisors (1).

221927689 is an equidigital number, since it uses as much as digits as its factorization.

221927689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 221927689 is about 14897.2376298427. The cubic root of 221927689 is about 605.4391447724.

The spelling of 221927689 in words is "two hundred twenty-one million, nine hundred twenty-seven thousand, six hundred eighty-nine".