4220546521 has 2 divisors, whose sum is σ = 4220546522. Its totient is φ = 4220546520.

The previous prime is 4220546461. The next prime is 4220546543. The reversal of 4220546521 is 1256450224.

4220546521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4191267600 + 29278921 = 64740^2 + 5411^2 .

It is a cyclic number.

It is not a de Polignac number, because 4220546521 - 2⁹ = 4220546009 is a prime.

It is not a weakly prime, because it can be changed into another prime (4220546221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110273260 + 2110273261.

It is an arithmetic number, because the mean of its divisors is an integer number (2110273261).

Almost surely, 2^4220546521 is an apocalyptic number.

It is an amenable number.

4220546521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4220546521 is an equidigital number, since it uses as much as digits as its factorization.

4220546521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 4220546521 is about 64965.7334369435. The cubic root of 4220546521 is about 1616.0553471766.

Adding to 4220546521 its reverse (1256450224), we get a palindrome (5476996745).

The spelling of 4220546521 in words is "four billion, two hundred twenty million, five hundred forty-six thousand, five hundred twenty-one".