225434021 has 2 divisors, whose sum is σ = 225434022. Its totient is φ = 225434020.

The previous prime is 225434009. The next prime is 225434087. The reversal of 225434021 is 120434522.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200533921 + 24900100 = 14161^2 + 4990^2 .

It is a cyclic number.

It is not a de Polignac number, because 225434021 - 2¹⁰ = 225432997 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 (225434621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112717010 + 112717011.

It is an arithmetic number, because the mean of its divisors is an integer number (112717011).

Almost surely, 2^225434021 is an apocalyptic number.

It is an amenable number.

225434021 is a deficient number, since it is larger than the sum of its proper divisors (1).

225434021 is an equidigital number, since it uses as much as digits as its factorization.

225434021 is an evil number, because the sum of its binary digits is even.

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

The square root of 225434021 is about 15014.4603965644. The cubic root of 225434021 is about 608.6110303471.

Adding to 225434021 its reverse (120434522), we get a palindrome (345868543).

The spelling of 225434021 in words is "two hundred twenty-five million, four hundred thirty-four thousand, twenty-one".