2225775221 has 2 divisors, whose sum is σ = 2225775222. Its totient is φ = 2225775220.

The previous prime is 2225775191. The next prime is 2225775257. The reversal of 2225775221 is 1225775222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2072980900 + 152794321 = 45530^2 + 12361^2 .

It is a cyclic number.

It is not a de Polignac number, because 2225775221 - 2¹⁰ = 2225774197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2225775271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1112887610 + 1112887611.

It is an arithmetic number, because the mean of its divisors is an integer number (1112887611).

Almost surely, 2^2225775221 is an apocalyptic number.

It is an amenable number.

2225775221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2225775221 is an equidigital number, since it uses as much as digits as its factorization.

2225775221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39200, while the sum is 35.

The square root of 2225775221 is about 47178.1222708153. The cubic root of 2225775221 is about 1305.6509860619.

Subtracting from 2225775221 its reverse (1225775222), we obtain a palindrome (999999999).

The spelling of 2225775221 in words is "two billion, two hundred twenty-five million, seven hundred seventy-five thousand, two hundred twenty-one".