221306224169 has 2 divisors, whose sum is σ = 221306224170. Its totient is φ = 221306224168.

The previous prime is 221306224129. The next prime is 221306224187. The reversal of 221306224169 is 961422603122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205741166569 + 15565057600 = 453587^2 + 124760^2 .

It is a cyclic number.

It is not a de Polignac number, because 221306224169 - 2³² = 217011256873 is a prime.

It is a super-2 number, since 2×221306224169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221306224129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110653112084 + 110653112085.

It is an arithmetic number, because the mean of its divisors is an integer number (110653112085).

Almost surely, 2^221306224169 is an apocalyptic number.

It is an amenable number.

221306224169 is a deficient number, since it is larger than the sum of its proper divisors (1).

221306224169 is an equidigital number, since it uses as much as digits as its factorization.

221306224169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 221306224169 in words is "two hundred twenty-one billion, three hundred six million, two hundred twenty-four thousand, one hundred sixty-nine".