1220010221 has 2 divisors, whose sum is σ = 1220010222. Its totient is φ = 1220010220.

The previous prime is 1220010217. The next prime is 1220010247. The reversal of 1220010221 is 1220100221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1168887721 + 51122500 = 34189^2 + 7150^2 .

It is an emirp because it is prime and its reverse (1220100221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220010221 - 2² = 1220010217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220010521) 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, 610005110 + 610005111.

It is an arithmetic number, because the mean of its divisors is an integer number (610005111).

Almost surely, 2^1220010221 is an apocalyptic number.

It is an amenable number.

1220010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220010221 is an equidigital number, since it uses as much as digits as its factorization.

1220010221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1220010221 is about 34928.6447060289. The cubic root of 1220010221 is about 1068.5327141412.

Adding to 1220010221 its reverse (1220100221), we get a palindrome (2440110442).

Subtracting 1220010221 from its reverse (1220100221), we obtain a square (90000 = 300²).

The spelling of 1220010221 in words is "one billion, two hundred twenty million, ten thousand, two hundred twenty-one".