5221220221 has 4 divisors (see below), whose sum is σ = 5967108832. Its totient is φ = 4475331612.

The previous prime is 5221220203. The next prime is 5221220231. The reversal of 5221220221 is 1220221225.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5221220221 - 2⁵ = 5221220189 is a prime.

It is a super-2 number, since 2×5221220221² = 54522281192358577682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5221220231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372944295 + ... + 372944308.

It is an arithmetic number, because the mean of its divisors is an integer number (1491777208).

Almost surely, 2^5221220221 is an apocalyptic number.

It is an amenable number.

5221220221 is a deficient number, since it is larger than the sum of its proper divisors (745888611).

5221220221 is an equidigital number, since it uses as much as digits as its factorization.

5221220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745888610.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 5221220221 is about 72258.0114658575. The cubic root of 5221220221 is about 1734.8316513980.

Adding to 5221220221 its reverse (1220221225), we get a palindrome (6441441446).

The spelling of 5221220221 in words is "five billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-one".