2221100221 has 2 divisors, whose sum is σ = 2221100222. Its totient is φ = 2221100220.

The previous prime is 2221100207. The next prime is 2221100243. The reversal of 2221100221 is 1220011222.

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., 1268143321 + 952956900 = 35611^2 + 30870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221100221 - 2⁹ = 2221099709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221100251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110550110 + 1110550111.

It is an arithmetic number, because the mean of its divisors is an integer number (1110550111).

Almost surely, 2^2221100221 is an apocalyptic number.

It is an amenable number.

2221100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221100221 is an equidigital number, since it uses as much as digits as its factorization.

2221100221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2221100221 is about 47128.5499564754. The cubic root of 2221100221 is about 1304.7362191025.

Adding to 2221100221 its reverse (1220011222), we get a palindrome (3441111443).

The spelling of 2221100221 in words is "two billion, two hundred twenty-one million, one hundred thousand, two hundred twenty-one".