2447220221 has 2 divisors, whose sum is σ = 2447220222. Its totient is φ = 2447220220.

The previous prime is 2447220169. The next prime is 2447220313. The reversal of 2447220221 is 1220227442.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2105524996 + 341695225 = 45886^2 + 18485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2447220221 - 2¹⁰ = 2447219197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2447222221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1223610110 + 1223610111.

It is an arithmetic number, because the mean of its divisors is an integer number (1223610111).

Almost surely, 2^2447220221 is an apocalyptic number.

It is an amenable number.

2447220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2447220221 is an equidigital number, since it uses as much as digits as its factorization.

2447220221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 2447220221 is about 49469.3867053150. The cubic root of 2447220221 is about 1347.5897039631.

Adding to 2447220221 its reverse (1220227442), we get a palindrome (3667447663).

The spelling of 2447220221 in words is "two billion, four hundred forty-seven million, two hundred twenty thousand, two hundred twenty-one".