225441021 has 16 divisors (see below), whose sum is σ = 334154240. Its totient is φ = 134256960.

The previous prime is 225441019. The next prime is 225441049. The reversal of 225441021 is 120144522.

It is not a de Polignac number, because 225441021 - 2¹ = 225441019 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 (225441071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92026 + ... + 94443.

It is an arithmetic number, because the mean of its divisors is an integer number (20884640).

Almost surely, 2^225441021 is an apocalyptic number.

It is an amenable number.

225441021 is a deficient number, since it is larger than the sum of its proper divisors (108713219).

225441021 is a wasteful number, since it uses less digits than its factorization.

225441021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186516.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 225441021 is about 15014.6935033653. The cubic root of 225441021 is about 608.6173296523.

Adding to 225441021 its reverse (120144522), we get a palindrome (345585543).

The spelling of 225441021 in words is "two hundred twenty-five million, four hundred forty-one thousand, twenty-one".