5220616221 has 12 divisors (see below), whose sum is σ = 7800921180. Its totient is φ = 3360396480.

The previous prime is 5220616217. The next prime is 5220616231. The reversal of 5220616221 is 1226160225.

5220616221 is a `hidden beast` number, since 5 + 2 + 20 + 616 + 2 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2117012121 + 3103604100 = 46011^2 + 55710^2 .

It is not a de Polignac number, because 5220616221 - 2² = 5220616217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5220616231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10000920 + ... + 10001441.

It is an arithmetic number, because the mean of its divisors is an integer number (650076765).

Almost surely, 2^5220616221 is an apocalyptic number.

It is an amenable number.

5220616221 is a deficient number, since it is larger than the sum of its proper divisors (2580304959).

5220616221 is a wasteful number, since it uses less digits than its factorization.

5220616221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20002396 (or 20002393 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 5220616221 is about 72253.8318776243. The cubic root of 5220616221 is about 1734.7647526859.

Adding to 5220616221 its reverse (1226160225), we get a palindrome (6446776446).

The spelling of 5220616221 in words is "five billion, two hundred twenty million, six hundred sixteen thousand, two hundred twenty-one".