225344021 has 4 divisors (see below), whose sum is σ = 257536032. Its totient is φ = 193152012.

The previous prime is 225343999. The next prime is 225344057. The reversal of 225344021 is 120443522.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 225344021 - 2⁶ = 225343957 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 (225344081) 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, 16095995 + ... + 16096008.

It is an arithmetic number, because the mean of its divisors is an integer number (64384008).

Almost surely, 2^225344021 is an apocalyptic number.

It is an amenable number.

225344021 is a deficient number, since it is larger than the sum of its proper divisors (32192011).

225344021 is an equidigital number, since it uses as much as digits as its factorization.

225344021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32192010.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 225344021 is about 15011.4629866646. The cubic root of 225344021 is about 608.5300276612.

Adding to 225344021 its reverse (120443522), we get a palindrome (345787543).

The spelling of 225344021 in words is "two hundred twenty-five million, three hundred forty-four thousand, twenty-one".