5638610221 has 16 divisors (see below), whose sum is σ = 6021294400. Its totient is φ = 5265036288.

The previous prime is 5638610207. The next prime is 5638610261. The reversal of 5638610221 is 1220168365.

It is a cyclic number.

It is not a de Polignac number, because 5638610221 - 2⁵ = 5638610189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5638610261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392650 + ... + 406756.

It is an arithmetic number, because the mean of its divisors is an integer number (376330900).

Almost surely, 2^5638610221 is an apocalyptic number.

It is an amenable number.

5638610221 is a deficient number, since it is larger than the sum of its proper divisors (382684179).

5638610221 is a wasteful number, since it uses less digits than its factorization.

5638610221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14428.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 5638610221 is about 75090.6799875990. The cubic root of 5638610221 is about 1779.8798703804.

Adding to 5638610221 its reverse (1220168365), we get a palindrome (6858778586).

The spelling of 5638610221 in words is "five billion, six hundred thirty-eight million, six hundred ten thousand, two hundred twenty-one".