225336421 has 4 divisors (see below), whose sum is σ = 225702252. Its totient is φ = 224970592.

The previous prime is 225336413. The next prime is 225336431. The reversal of 225336421 is 124633522.

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 112148100 + 113188321 = 10590^2 + 10639^2 .

It is a cyclic number.

It is not a de Polignac number, because 225336421 - 2³ = 225336413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225336421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225336431) 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, 181990 + ... + 183223.

It is an arithmetic number, because the mean of its divisors is an integer number (56425563).

Almost surely, 2^225336421 is an apocalyptic number.

It is an amenable number.

225336421 is a deficient number, since it is larger than the sum of its proper divisors (365831).

225336421 is an equidigital number, since it uses as much as digits as its factorization.

225336421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365830.

The product of its digits is 8640, while the sum is 28.

The square root of 225336421 is about 15011.2098446461. The cubic root of 225336421 is about 608.5231864469.

Adding to 225336421 its reverse (124633522), we get a palindrome (349969943).

The spelling of 225336421 in words is "two hundred twenty-five million, three hundred thirty-six thousand, four hundred twenty-one".