5220155221 has 2 divisors, whose sum is σ = 5220155222. Its totient is φ = 5220155220.

The previous prime is 5220155207. The next prime is 5220155261. The reversal of 5220155221 is 1225510225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4525252900 + 694902321 = 67270^2 + 26361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5220155221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5220155261) 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, 2610077610 + 2610077611.

It is an arithmetic number, because the mean of its divisors is an integer number (2610077611).

Almost surely, 2^5220155221 is an apocalyptic number.

It is an amenable number.

5220155221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5220155221 is an equidigital number, since it uses as much as digits as its factorization.

5220155221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 5220155221 is about 72250.6416649707. The cubic root of 5220155221 is about 1734.7136891040.

Adding to 5220155221 its reverse (1225510225), we get a palindrome (6445665446).

The spelling of 5220155221 in words is "five billion, two hundred twenty million, one hundred fifty-five thousand, two hundred twenty-one".