221797 has 2 divisors, whose sum is σ = 221798. Its totient is φ = 221796.

The previous prime is 221773. The next prime is 221807. The reversal of 221797 is 797122.

It is a happy number.

221797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123201 + 98596 = 351^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 221797 - 2¹¹ = 219749 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110898 + 110899.

It is an arithmetic number, because the mean of its divisors is an integer number (110899).

2²²¹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

221797 is a deficient number, since it is larger than the sum of its proper divisors (1).

221797 is an equidigital number, since it uses as much as digits as its factorization.

221797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 28.

The square root of 221797 is about 470.9532885542. The cubic root of 221797 is about 60.5320277566.

The spelling of 221797 in words is "two hundred twenty-one thousand, seven hundred ninety-seven".