2420420221 has 2 divisors, whose sum is σ = 2420420222. Its totient is φ = 2420420220.

The previous prime is 2420420213. The next prime is 2420420227. The reversal of 2420420221 is 1220240242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2293068996 + 127351225 = 47886^2 + 11285^2 .

It is a cyclic number.

It is not a de Polignac number, because 2420420221 - 2³ = 2420420213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2420420227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210210110 + 1210210111.

It is an arithmetic number, because the mean of its divisors is an integer number (1210210111).

Almost surely, 2^2420420221 is an apocalyptic number.

It is an amenable number.

2420420221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2420420221 is an equidigital number, since it uses as much as digits as its factorization.

2420420221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 2420420221 is about 49197.7664228774. The cubic root of 2420420221 is about 1342.6523948988.

Adding to 2420420221 its reverse (1220240242), we get a palindrome (3640660463).

The spelling of 2420420221 in words is "two billion, four hundred twenty million, four hundred twenty thousand, two hundred twenty-one".