4425522221 has 2 divisors, whose sum is σ = 4425522222. Its totient is φ = 4425522220.

The previous prime is 4425522217. The next prime is 4425522239. The reversal of 4425522221 is 1222255244.

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., 4226430121 + 199092100 = 65011^2 + 14110^2 .

It is a cyclic number.

It is not a de Polignac number, because 4425522221 - 2² = 4425522217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4425522271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2212761110 + 2212761111.

It is an arithmetic number, because the mean of its divisors is an integer number (2212761111).

Almost surely, 2^4425522221 is an apocalyptic number.

It is an amenable number.

4425522221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4425522221 is an equidigital number, since it uses as much as digits as its factorization.

4425522221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12800, while the sum is 29.

The square root of 4425522221 is about 66524.5986158504. The cubic root of 4425522221 is about 1641.8047528787.

Adding to 4425522221 its reverse (1222255244), we get a palindrome (5647777465).

The spelling of 4425522221 in words is "four billion, four hundred twenty-five million, five hundred twenty-two thousand, two hundred twenty-one".