225341021 has 2 divisors, whose sum is σ = 225341022. Its totient is φ = 225341020.

The previous prime is 225340993. The next prime is 225341029. The reversal of 225341021 is 120143522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217562500 + 7778521 = 14750^2 + 2789^2 .

It is a cyclic number.

It is not a de Polignac number, because 225341021 - 2⁶ = 225340957 is a prime.

It is equal to p_12400517 and since 225341021 and 12400517 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 225340984 and 225341002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225341029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112670510 + 112670511.

It is an arithmetic number, because the mean of its divisors is an integer number (112670511).

Almost surely, 2^225341021 is an apocalyptic number.

It is an amenable number.

225341021 is a deficient number, since it is larger than the sum of its proper divisors (1).

225341021 is an equidigital number, since it uses as much as digits as its factorization.

225341021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 225341021 is about 15011.3630626935. The cubic root of 225341021 is about 608.5273272002.

Adding to 225341021 its reverse (120143522), we get a palindrome (345484543).

The spelling of 225341021 in words is "two hundred twenty-five million, three hundred forty-one thousand, twenty-one".