455521221 has 12 divisors (see below), whose sum is σ = 668762380. Its totient is φ = 298702080.

The previous prime is 455521159. The next prime is 455521243. The reversal of 455521221 is 122125554.

It can be written as a sum of positive squares in 2 ways, for example, as 139570596 + 315950625 = 11814^2 + 17775^2 .

It is not a de Polignac number, because 455521221 - 2¹⁴ = 455504837 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 (455521421) 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, 414316 + ... + 415413.

Almost surely, 2^455521221 is an apocalyptic number.

It is an amenable number.

455521221 is a deficient number, since it is larger than the sum of its proper divisors (213241159).

455521221 is a wasteful number, since it uses less digits than its factorization.

455521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829796 (or 829793 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 455521221 is about 21342.9431194482. The cubic root of 455521221 is about 769.4307486567.

Adding to 455521221 its reverse (122125554), we get a palindrome (577646775).

The spelling of 455521221 in words is "four hundred fifty-five million, five hundred twenty-one thousand, two hundred twenty-one".