450521221 has 4 divisors (see below), whose sum is σ = 450576000. Its totient is φ = 450466444.

The previous prime is 450521219. The next prime is 450521231. The reversal of 450521221 is 122125054.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 450521221 - 2¹ = 450521219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 450521192 and 450521201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450521231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12271 + ... + 32428.

It is an arithmetic number, because the mean of its divisors is an integer number (112644000).

Almost surely, 2^450521221 is an apocalyptic number.

It is an amenable number.

450521221 is a deficient number, since it is larger than the sum of its proper divisors (54779).

450521221 is a wasteful number, since it uses less digits than its factorization.

450521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54778.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 450521221 is about 21225.4851770225. The cubic root of 450521221 is about 766.6051823619.

Adding to 450521221 its reverse (122125054), we get a palindrome (572646275).

The spelling of 450521221 in words is "four hundred fifty million, five hundred twenty-one thousand, two hundred twenty-one".