4555541221 has 36 divisors (see below), whose sum is σ = 6167628684. Its totient is φ = 3340888320.

The previous prime is 4555541219. The next prime is 4555541257. The reversal of 4555541221 is 1221455554.

It can be written as a sum of positive squares in 2 ways, for example, as 3967236196 + 588305025 = 62986^2 + 24255^2 .

It is not a de Polignac number, because 4555541221 - 2¹ = 4555541219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4555541281) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 78195 + ... + 123391.

It is an arithmetic number, because the mean of its divisors is an integer number (171323019).

Almost surely, 2^4555541221 is an apocalyptic number.

It is an amenable number.

4555541221 is a deficient number, since it is larger than the sum of its proper divisors (1612087463).

4555541221 is a wasteful number, since it uses less digits than its factorization.

4555541221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45250 (or 45232 counting only the distinct ones).

The product of its digits is 40000, while the sum is 34.

The square root of 4555541221 is about 67494.7495809859. The cubic root of 4555541221 is about 1657.7282056780.

Adding to 4555541221 its reverse (1221455554), we get a palindrome (5776996775).

The spelling of 4555541221 in words is "four billion, five hundred fifty-five million, five hundred forty-one thousand, two hundred twenty-one".