225824021 has 2 divisors, whose sum is σ = 225824022. Its totient is φ = 225824020.

The previous prime is 225824017. The next prime is 225824069. The reversal of 225824021 is 120428522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139594225 + 86229796 = 11815^2 + 9286^2 .

It is a cyclic number.

It is not a de Polignac number, because 225824021 - 2² = 225824017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225824321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112912010 + 112912011.

It is an arithmetic number, because the mean of its divisors is an integer number (112912011).

Almost surely, 2^225824021 is an apocalyptic number.

It is an amenable number.

225824021 is a deficient number, since it is larger than the sum of its proper divisors (1).

225824021 is an equidigital number, since it uses as much as digits as its factorization.

225824021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 225824021 is about 15027.4422640714. The cubic root of 225824021 is about 608.9617930756.

The spelling of 225824021 in words is "two hundred twenty-five million, eight hundred twenty-four thousand, twenty-one".