221383577 has 2 divisors, whose sum is σ = 221383578. Its totient is φ = 221383576.

The previous prime is 221383567. The next prime is 221383601. The reversal of 221383577 is 775383122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134073241 + 87310336 = 11579^2 + 9344^2 .

It is a cyclic number.

It is not a de Polignac number, because 221383577 - 2¹⁴ = 221367193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221383577.

It is not a weakly prime, because it can be changed into another prime (221383507) 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, 110691788 + 110691789.

It is an arithmetic number, because the mean of its divisors is an integer number (110691789).

Almost surely, 2^221383577 is an apocalyptic number.

It is an amenable number.

221383577 is a deficient number, since it is larger than the sum of its proper divisors (1).

221383577 is an equidigital number, since it uses as much as digits as its factorization.

221383577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The square root of 221383577 is about 14878.9642448660. The cubic root of 221383577 is about 604.9439439901.

The spelling of 221383577 in words is "two hundred twenty-one million, three hundred eighty-three thousand, five hundred seventy-seven".