4511201221 has 8 divisors (see below), whose sum is σ = 4580966744. Its totient is φ = 4441651200.

The previous prime is 4511201197. The next prime is 4511201239. The reversal of 4511201221 is 1221021154.

It can be written as a sum of positive squares in 4 ways, for example, as 938748321 + 3572452900 = 30639^2 + 59770^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4511201221 - 2⁹ = 4511200709 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 (4511201021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11430 + ... + 95671.

It is an arithmetic number, because the mean of its divisors is an integer number (572620843).

Almost surely, 2^4511201221 is an apocalyptic number.

It is an amenable number.

4511201221 is a deficient number, since it is larger than the sum of its proper divisors (69765523).

4511201221 is a wasteful number, since it uses less digits than its factorization.

4511201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107751.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 4511201221 is about 67165.4764071543. The cubic root of 4511201221 is about 1652.3323270954.

Adding to 4511201221 its reverse (1221021154), we get a palindrome (5732222375).

The spelling of 4511201221 in words is "four billion, five hundred eleven million, two hundred one thousand, two hundred twenty-one".