220043221 has 2 divisors, whose sum is σ = 220043222. Its totient is φ = 220043220.

The previous prime is 220043207. The next prime is 220043233. The reversal of 220043221 is 122340022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115799121 + 104244100 = 10761^2 + 10210^2 .

It is a cyclic number.

It is not a de Polignac number, because 220043221 - 2⁹ = 220042709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220043195 and 220043204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220043251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110021610 + 110021611.

It is an arithmetic number, because the mean of its divisors is an integer number (110021611).

Almost surely, 2^220043221 is an apocalyptic number.

It is an amenable number.

220043221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220043221 is an equidigital number, since it uses as much as digits as its factorization.

220043221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 220043221 is about 14833.8538822519. The cubic root of 220043221 is about 603.7206039695.

Adding to 220043221 its reverse (122340022), we get a palindrome (342383243).

The spelling of 220043221 in words is "two hundred twenty million, forty-three thousand, two hundred twenty-one".