455221221 has 48 divisors (see below), whose sum is σ = 793505664. Its totient is φ = 229654656.

The previous prime is 455221183. The next prime is 455221229. The reversal of 455221221 is 122122554.

It is not a de Polignac number, because 455221221 - 2⁶ = 455221157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 455221191 and 455221200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (455221229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38775 + ... + 49131.

It is an arithmetic number, because the mean of its divisors is an integer number (16531368).

Almost surely, 2^455221221 is an apocalyptic number.

It is an amenable number.

455221221 is a deficient number, since it is larger than the sum of its proper divisors (338284443).

455221221 is a wasteful number, since it uses less digits than its factorization.

455221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10410 (or 10403 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 455221221 is about 21335.9138777789. The cubic root of 455221221 is about 769.2617993988.

Adding to 455221221 its reverse (122122554), we get a palindrome (577343775).

The spelling of 455221221 in words is "four hundred fifty-five million, two hundred twenty-one thousand, two hundred twenty-one".