224420521 has 4 divisors (see below), whose sum is σ = 241683652. Its totient is φ = 207157392.

The previous prime is 224420507. The next prime is 224420543. The reversal of 224420521 is 125024422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10208025 + 214212496 = 3195^2 + 14636^2 .

It is not a de Polignac number, because 224420521 - 2⁵ = 224420489 is a prime.

It is a super-2 number, since 2×224420521² = 100729140491822882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 224420492 and 224420501.

It is not an unprimeable number, because it can be changed into a prime (224420221) 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, 8631546 + ... + 8631571.

It is an arithmetic number, because the mean of its divisors is an integer number (60420913).

Almost surely, 2^224420521 is an apocalyptic number.

It is an amenable number.

224420521 is a deficient number, since it is larger than the sum of its proper divisors (17263131).

224420521 is a wasteful number, since it uses less digits than its factorization.

224420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17263130.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 224420521 is about 14980.6715804065. The cubic root of 224420521 is about 607.6976012739.

Adding to 224420521 its reverse (125024422), we get a palindrome (349444943).

The spelling of 224420521 in words is "two hundred twenty-four million, four hundred twenty thousand, five hundred twenty-one".